5640542656 has 28 divisors (see below), whose sum is σ = 12791945968. Its totient is φ = 2417375232.

The previous prime is 5640542641. The next prime is 5640542669. The reversal of 5640542656 is 6562450465.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6294801 + ... + 6295696.

Almost surely, 2^5640542656 is an apocalyptic number.

5640542656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

5640542656 is an abundant number, since it is smaller than the sum of its proper divisors (7151403312).

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

5640542656 is a wasteful number, since it uses less digits than its factorization.

5640542656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12590516 (or 12590506 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

The square root of 5640542656 is about 75103.5462278580. The cubic root of 5640542656 is about 1780.0831775296.

The spelling of 5640542656 in words is "five billion, six hundred forty million, five hundred forty-two thousand, six hundred fifty-six".