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2066631561 = 32811283139
BaseRepresentation
bin111101100101110…
…0100101110001001
312100000201202112200
41323023210232021
513213024202221
6541023030413
7102133035621
oct17313445611
95300652480
102066631561
11970617975
1249813b409
1326c206917
14158681881
15c1675426
hex7b2e4b89

2066631561 has 12 divisors (see below), whose sum is σ = 2988825840. Its totient is φ = 1376050680.

The previous prime is 2066631551. The next prime is 2066631563. The reversal of 2066631561 is 1651366602.

It is not a de Polignac number, because 2066631561 - 217 = 2066500489 is a prime.

It is a super-4 number, since 4×20666315614 (a number of 38 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2066631563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134271 + ... + 148868.

It is an arithmetic number, because the mean of its divisors is an integer number (249068820).

Almost surely, 22066631561 is an apocalyptic number.

It is an amenable number.

2066631561 is a deficient number, since it is larger than the sum of its proper divisors (922194279).

2066631561 is a wasteful number, since it uses less digits than its factorization.

2066631561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283956 (or 283953 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 2066631561 is about 45460.2195441245. The cubic root of 2066631561 is about 1273.7602324830.

The spelling of 2066631561 in words is "two billion, sixty-six million, six hundred thirty-one thousand, five hundred sixty-one".

Divisors: 1 3 9 811 2433 7299 283139 849417 2548251 229625729 688877187 2066631561