65616155161656 has 64 divisors (see below), whose sum is σ = 179247966612480. Its totient is φ = 19850926030080.

The previous prime is 65616155161649. The next prime is 65616155161681.

It is a happy number.

65616155161656 is nontrivially palindromic in base 10.

It is a super-4 number, since 4×65616155161656⁴ (a number of 56 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65616155161656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204572901 + ... + 204893396.

It is an arithmetic number, because the mean of its divisors is an integer number (2800749478320).

Almost surely, 2^{65616155161656} is an apocalyptic number.

65616155161656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

65616155161656 is an abundant number, since it is smaller than the sum of its proper divisors (113631811450824).

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

65616155161656 is a wasteful number, since it uses less digits than its factorization.

65616155161656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409466924 (or 409466920 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 60.

The spelling of 65616155161656 in words is "sixty-five trillion, six hundred sixteen billion, one hundred fifty-five million, one hundred sixty-one thousand, six hundred fifty-six".