1609551066 has 16 divisors (see below), whose sum is σ = 3388528800. Its totient is φ = 508279248.

The previous prime is 1609551061. The next prime is 1609551089. The reversal of 1609551066 is 6601559061.

It is not an unprimeable number, because it can be changed into a prime (1609551061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7059321 + ... + 7059548.

It is an arithmetic number, because the mean of its divisors is an integer number (211783050).

Almost surely, 2^1609551066 is an apocalyptic number.

1609551066 is an abundant number, since it is smaller than the sum of its proper divisors (1778977734).

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

1609551066 is a wasteful number, since it uses less digits than its factorization.

1609551066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14118893.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 1609551066 is about 40119.2106851568. The cubic root of 1609551066 is about 1171.9297702601.

It can be divided in two parts, 16095 and 51066, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 1609551066 in words is "one billion, six hundred nine million, five hundred fifty-one thousand, sixty-six".