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1561666016 = 25677110259
BaseRepresentation
bin101110100010101…
…0010000111100000
311000211112212001002
41131011102013200
511144241303031
6414543531132
753461641101
oct13505220740
94024485032
101561666016
11731579879
12376bb9aa8
131bb703641
1410b5963a8
159217accb
hex5d1521e0

1561666016 has 48 divisors (see below), whose sum is σ = 3164676480. Its totient is φ = 758271360.

The previous prime is 1561666003. The next prime is 1561666081. The reversal of 1561666016 is 6106661651.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147095 + ... + 157353.

It is an arithmetic number, because the mean of its divisors is an integer number (65930760).

Almost surely, 21561666016 is an apocalyptic number.

1561666016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561666016 is an abundant number, since it is smaller than the sum of its proper divisors (1603010464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561666016 is a wasteful number, since it uses less digits than its factorization.

1561666016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407 (or 10399 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1561666016 is about 39517.9201881880. The cubic root of 1561666016 is about 1160.1907177502.

The spelling of 1561666016 in words is "one billion, five hundred sixty-one million, six hundred sixty-six thousand, sixteen".

Divisors: 1 2 4 8 16 32 67 71 134 142 268 284 536 568 1072 1136 2144 2272 4757 9514 10259 19028 20518 38056 41036 76112 82072 152224 164144 328288 687353 728389 1374706 1456778 2749412 2913556 5498824 5827112 10997648 11654224 21995296 23308448 48802063 97604126 195208252 390416504 780833008 1561666016