56203297991 has 2 divisors, whose sum is σ = 56203297992. Its totient is φ = 56203297990.

The previous prime is 56203297901. The next prime is 56203298017. The reversal of 56203297991 is 19979230265.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56203297991 - 2²² = 56199103687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56203297901) 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, 28101648995 + 28101648996.

It is an arithmetic number, because the mean of its divisors is an integer number (28101648996).

Almost surely, 2^56203297991 is an apocalyptic number.

56203297991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56203297991 is an equidigital number, since it uses as much as digits as its factorization.

56203297991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 56203297991 in words is "fifty-six billion, two hundred three million, two hundred ninety-seven thousand, nine hundred ninety-one".