61613787957 has 16 divisors (see below), whose sum is σ = 84940190208. Its totient is φ = 39685947840.

The previous prime is 61613787943. The next prime is 61613787967. The reversal of 61613787957 is 75978731616.

It is not a de Polignac number, because 61613787957 - 2¹⁰ = 61613786933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61613787957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61613787967) 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, 483378 + ... + 597395.

It is an arithmetic number, because the mean of its divisors is an integer number (5308761888).

Almost surely, 2^61613787957 is an apocalyptic number.

It is an amenable number.

61613787957 is a deficient number, since it is larger than the sum of its proper divisors (23326402251).

61613787957 is a wasteful number, since it uses less digits than its factorization.

61613787957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081420.

The product of its digits is 13335840, while the sum is 60.

The spelling of 61613787957 in words is "sixty-one billion, six hundred thirteen million, seven hundred eighty-seven thousand, nine hundred fifty-seven".