61979081618 has 16 divisors (see below), whose sum is σ = 95495676864. Its totient is φ = 30147441840.

The previous prime is 61979081611. The next prime is 61979081639. The reversal of 61979081618 is 81618097916.

It is not an unprimeable number, because it can be changed into a prime (61979081611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460403 + ... + 579593.

It is an arithmetic number, because the mean of its divisors is an integer number (5968479804).

Almost surely, 2^61979081618 is an apocalyptic number.

61979081618 is a deficient number, since it is larger than the sum of its proper divisors (33516595246).

61979081618 is a wasteful number, since it uses less digits than its factorization.

61979081618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126257.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 61979081618 in words is "sixty-one billion, nine hundred seventy-nine million, eighty-one thousand, six hundred eighteen".