56557548491 has 2 divisors, whose sum is σ = 56557548492. Its totient is φ = 56557548490.

The previous prime is 56557548479. The next prime is 56557548493. The reversal of 56557548491 is 19484575565.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56557548491 is a prime.

Together with 56557548493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56557548491.

It is not a weakly prime, because it can be changed into another prime (56557548493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278774245 + 28278774246.

It is an arithmetic number, because the mean of its divisors is an integer number (28278774246).

Almost surely, 2^56557548491 is an apocalyptic number.

56557548491 is a deficient number, since it is larger than the sum of its proper divisors (1).

56557548491 is an equidigital number, since it uses as much as digits as its factorization.

56557548491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240000, while the sum is 59.

The spelling of 56557548491 in words is "fifty-six billion, five hundred fifty-seven million, five hundred forty-eight thousand, four hundred ninety-one".