56991426307213 has 2 divisors, whose sum is σ = 56991426307214. Its totient is φ = 56991426307212.

The previous prime is 56991426307169. The next prime is 56991426307261. The reversal of 56991426307213 is 31270362419965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52049688415209 + 4941737892004 = 7214547^2 + 2223002^2 .

It is a cyclic number.

It is not a de Polignac number, because 56991426307213 - 2¹⁷ = 56991426176141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56991426337213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28495713153606 + 28495713153607.

It is an arithmetic number, because the mean of its divisors is an integer number (28495713153607).

Almost surely, 2^{56991426307213} is an apocalyptic number.

It is an amenable number.

56991426307213 is a deficient number, since it is larger than the sum of its proper divisors (1).

56991426307213 is an equidigital number, since it uses as much as digits as its factorization.

56991426307213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 58.

The spelling of 56991426307213 in words is "fifty-six trillion, nine hundred ninety-one billion, four hundred twenty-six million, three hundred seven thousand, two hundred thirteen".