56642440618 has 4 divisors (see below), whose sum is σ = 84963660930. Its totient is φ = 28321220308.

The previous prime is 56642440579. The next prime is 56642440619. The reversal of 56642440618 is 81604424665.

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., 52534015209 + 4108425409 = 229203^2 + 64097^2 .

It is not an unprimeable number, because it can be changed into a prime (56642440619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160610153 + ... + 14160610156.

Almost surely, 2^56642440618 is an apocalyptic number.

56642440618 is a deficient number, since it is larger than the sum of its proper divisors (28321220312).

56642440618 is a wasteful number, since it uses less digits than its factorization.

56642440618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28321220311.

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 56642440618 in words is "fifty-six billion, six hundred forty-two million, four hundred forty thousand, six hundred eighteen".