165565747565560 has 64 divisors (see below), whose sum is σ = 394521366182400. Its totient is φ = 62401418656896.

The previous prime is 165565747565539. The next prime is 165565747565671. The reversal of 165565747565560 is 65565747565561.

It is a happy number.

It is a super-2 number, since 2×165565747565560² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (73) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342944100 + ... + 1343067379.

It is an arithmetic number, because the mean of its divisors is an integer number (6164396346600).

Almost surely, 2^{165565747565560} is an apocalyptic number.

165565747565560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165565747565560 is an abundant number, since it is smaller than the sum of its proper divisors (228955618616840).

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

165565747565560 is a wasteful number, since it uses less digits than its factorization.

165565747565560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686011580 (or 2686011576 counting only the distinct ones).

The product of its (nonzero) digits is 3969000000, while the sum is 73.

Subtracting from 165565747565560 its reverse (65565747565561), we obtain a palindrome (99999999999999).

The spelling of 165565747565560 in words is "one hundred sixty-five trillion, five hundred sixty-five billion, seven hundred forty-seven million, five hundred sixty-five thousand, five hundred sixty".