56457731261 has 2 divisors, whose sum is σ = 56457731262. Its totient is φ = 56457731260.

The previous prime is 56457731257. The next prime is 56457731329. The reversal of 56457731261 is 16213775465.

56457731261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56164260100 + 293471161 = 236990^2 + 17131^2 .

It is a cyclic number.

It is not a de Polignac number, because 56457731261 - 2² = 56457731257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56457731201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28228865630 + 28228865631.

It is an arithmetic number, because the mean of its divisors is an integer number (28228865631).

Almost surely, 2^56457731261 is an apocalyptic number.

It is an amenable number.

56457731261 is a deficient number, since it is larger than the sum of its proper divisors (1).

56457731261 is an equidigital number, since it uses as much as digits as its factorization.

56457731261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The spelling of 56457731261 in words is "fifty-six billion, four hundred fifty-seven million, seven hundred thirty-one thousand, two hundred sixty-one".