165561151101613 has 24 divisors (see below), whose sum is σ = 170418143427840. Its totient is φ = 160839111888000.

The previous prime is 165561151101589. The next prime is 165561151101659. The reversal of 165561151101613 is 316101151165561.

It is not a de Polignac number, because 165561151101613 - 2⁵ = 165561151101581 is a prime.

It is a super-2 number, since 2×165561151101613² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165561151101613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561151101013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7277081988 + ... + 7277104738.

It is an arithmetic number, because the mean of its divisors is an integer number (7100755976160).

Almost surely, 2^{165561151101613} is an apocalyptic number.

It is an amenable number.

165561151101613 is a deficient number, since it is larger than the sum of its proper divisors (4856992326227).

165561151101613 is an equidigital number, since it uses as much as digits as its factorization.

165561151101613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30757 (or 30720 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 43.

The spelling of 165561151101613 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty-one million, one hundred one thousand, six hundred thirteen".