56257356121 has 2 divisors, whose sum is σ = 56257356122. Its totient is φ = 56257356120.

The previous prime is 56257356107. The next prime is 56257356137. The reversal of 56257356121 is 12165375265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50710085721 + 5547270400 = 225189^2 + 74480^2 .

It is a cyclic number.

It is not a de Polignac number, because 56257356121 - 2²⁹ = 55720485209 is a prime.

It is not a weakly prime, because it can be changed into another prime (56257351121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28128678060 + 28128678061.

It is an arithmetic number, because the mean of its divisors is an integer number (28128678061).

Almost surely, 2^56257356121 is an apocalyptic number.

It is an amenable number.

56257356121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56257356121 is an equidigital number, since it uses as much as digits as its factorization.

56257356121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 43.

The spelling of 56257356121 in words is "fifty-six billion, two hundred fifty-seven million, three hundred fifty-six thousand, one hundred twenty-one".