56628507491 has 2 divisors, whose sum is σ = 56628507492. Its totient is φ = 56628507490.

The previous prime is 56628507461. The next prime is 56628507493. The reversal of 56628507491 is 19470582665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56628507491 - 2¹⁸ = 56628245347 is a prime.

Together with 56628507493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56628507493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28314253745 + 28314253746.

It is an arithmetic number, because the mean of its divisors is an integer number (28314253746).

Almost surely, 2^56628507491 is an apocalyptic number.

56628507491 is a deficient number, since it is larger than the sum of its proper divisors (1).

56628507491 is an equidigital number, since it uses as much as digits as its factorization.

56628507491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 56628507491 in words is "fifty-six billion, six hundred twenty-eight million, five hundred seven thousand, four hundred ninety-one".