56439769618 has 4 divisors (see below), whose sum is σ = 84659654430. Its totient is φ = 28219884808.

The previous prime is 56439769613. The next prime is 56439769619. The reversal of 56439769618 is 81696793465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29462692609 + 26977077009 = 171647^2 + 164247^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 56439769618.

It is not an unprimeable number, because it can be changed into a prime (56439769613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109942403 + ... + 14109942406.

Almost surely, 2^56439769618 is an apocalyptic number.

56439769618 is a deficient number, since it is larger than the sum of its proper divisors (28219884812).

56439769618 is a wasteful number, since it uses less digits than its factorization.

56439769618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28219884811.

The product of its digits is 58786560, while the sum is 64.

The spelling of 56439769618 in words is "fifty-six billion, four hundred thirty-nine million, seven hundred sixty-nine thousand, six hundred eighteen".