61639344393616 has 40 divisors (see below), whose sum is σ = 130333096764000. Its totient is φ = 28007144670720.

The previous prime is 61639344393607. The next prime is 61639344393659.

It is a happy number.

61639344393616 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66659166 + ... + 67577533.

It is an arithmetic number, because the mean of its divisors is an integer number (3258327419100).

Almost surely, 2^{61639344393616} is an apocalyptic number.

It is an amenable number.

61639344393616 is an abundant number, since it is smaller than the sum of its proper divisors (68693752370384).

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

61639344393616 is a wasteful number, since it uses less digits than its factorization.

61639344393616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134239327 (or 134239321 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 64.

The spelling of 61639344393616 in words is "sixty-one trillion, six hundred thirty-nine billion, three hundred forty-four million, three hundred ninety-three thousand, six hundred sixteen".