5656686021 has 12 divisors (see below), whose sum is σ = 9338021472. Its totient is φ = 3232391976.

The previous prime is 5656686019. The next prime is 5656686043. The reversal of 5656686021 is 1206866565.

It is a happy number.

5656686021 is a `hidden beast` number, since 5 + 6 + 566 + 8 + 60 + 21 = 666.

It is not a de Polignac number, because 5656686021 - 2¹ = 5656686019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5656686001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44894271 + ... + 44894396.

It is an arithmetic number, because the mean of its divisors is an integer number (778168456).

Almost surely, 2^5656686021 is an apocalyptic number.

It is an amenable number.

5656686021 is a deficient number, since it is larger than the sum of its proper divisors (3681335451).

5656686021 is a wasteful number, since it uses less digits than its factorization.

5656686021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89788680 (or 89788677 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 5656686021 is about 75210.9434922871. The cubic root of 5656686021 is about 1781.7797732207.

The spelling of 5656686021 in words is "five billion, six hundred fifty-six million, six hundred eighty-six thousand, twenty-one".