56539231993 has 2 divisors, whose sum is σ = 56539231994. Its totient is φ = 56539231992.

The previous prime is 56539231963. The next prime is 56539232041. The reversal of 56539231993 is 39913293565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35846984889 + 20692247104 = 189333^2 + 143848^2 .

It is a cyclic number.

It is not a de Polignac number, because 56539231993 - 2⁵ = 56539231961 is a prime.

It is not a weakly prime, because it can be changed into another prime (56539231943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28269615996 + 28269615997.

It is an arithmetic number, because the mean of its divisors is an integer number (28269615997).

Almost surely, 2^56539231993 is an apocalyptic number.

It is an amenable number.

56539231993 is a deficient number, since it is larger than the sum of its proper divisors (1).

56539231993 is an equidigital number, since it uses as much as digits as its factorization.

56539231993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5904900, while the sum is 55.

The spelling of 56539231993 in words is "fifty-six billion, five hundred thirty-nine million, two hundred thirty-one thousand, nine hundred ninety-three".