56720663 has 2 divisors, whose sum is σ = 56720664. Its totient is φ = 56720662.

The previous prime is 56720639. The next prime is 56720683. The reversal of 56720663 is 36602765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56720663 - 2⁸ = 56720407 is a prime.

It is a super-2 number, since 2×56720663² = 6434467222319138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56720633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28360331 + 28360332.

It is an arithmetic number, because the mean of its divisors is an integer number (28360332).

Almost surely, 2^56720663 is an apocalyptic number.

56720663 is a deficient number, since it is larger than the sum of its proper divisors (1).

56720663 is an equidigital number, since it uses as much as digits as its factorization.

56720663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 56720663 is about 7531.3121698679. The cubic root of 56720663 is about 384.2204115661.

The spelling of 56720663 in words is "fifty-six million, seven hundred twenty thousand, six hundred sixty-three".