56156661551 has 2 divisors, whose sum is σ = 56156661552. Its totient is φ = 56156661550.

The previous prime is 56156661481. The next prime is 56156661581. The reversal of 56156661551 is 15516665165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56156661551 - 2¹⁸ = 56156399407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56156661496 and 56156661505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56156661581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28078330775 + 28078330776.

It is an arithmetic number, because the mean of its divisors is an integer number (28078330776).

Almost surely, 2^56156661551 is an apocalyptic number.

56156661551 is a deficient number, since it is larger than the sum of its proper divisors (1).

56156661551 is an equidigital number, since it uses as much as digits as its factorization.

56156661551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810000, while the sum is 47.

The spelling of 56156661551 in words is "fifty-six billion, one hundred fifty-six million, six hundred sixty-one thousand, five hundred fifty-one".