61608571915 has 16 divisors (see below), whose sum is σ = 81787159296. Its totient is φ = 44175157600.

The previous prime is 61608571901. The next prime is 61608571919. The reversal of 61608571915 is 51917580616.

It is a happy number.

It is not a de Polignac number, because 61608571915 - 2²⁷ = 61474354187 is a prime.

It is a super-2 number, since 2×61608571915² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61608571919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7884517 + ... + 7892326.

It is an arithmetic number, because the mean of its divisors is an integer number (5111697456).

Almost surely, 2^61608571915 is an apocalyptic number.

61608571915 is a deficient number, since it is larger than the sum of its proper divisors (20178587381).

61608571915 is a wasteful number, since it uses less digits than its factorization.

61608571915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15776930.

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 61608571915 in words is "sixty-one billion, six hundred eight million, five hundred seventy-one thousand, nine hundred fifteen".