56557548431 has 2 divisors, whose sum is σ = 56557548432. Its totient is φ = 56557548430.

The previous prime is 56557548409. The next prime is 56557548479. The reversal of 56557548431 is 13484575565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56557548431 - 2⁶ = 56557548367 is a prime.

It is a super-2 number, since 2×56557548431² (a number of 22 digits) 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 (56557548491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278774215 + 28278774216.

It is an arithmetic number, because the mean of its divisors is an integer number (28278774216).

Almost surely, 2^56557548431 is an apocalyptic number.

56557548431 is a deficient number, since it is larger than the sum of its proper divisors (1).

56557548431 is an equidigital number, since it uses as much as digits as its factorization.

56557548431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080000, while the sum is 53.

The spelling of 56557548431 in words is "fifty-six billion, five hundred fifty-seven million, five hundred forty-eight thousand, four hundred thirty-one".