56615854121 has 2 divisors, whose sum is σ = 56615854122. Its totient is φ = 56615854120.

The previous prime is 56615854093. The next prime is 56615854151. The reversal of 56615854121 is 12145851665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45207264400 + 11408589721 = 212620^2 + 106811^2 .

It is a cyclic number.

It is not a de Polignac number, because 56615854121 - 2³⁴ = 39435984937 is a prime.

It is not a weakly prime, because it can be changed into another prime (56615854151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28307927060 + 28307927061.

It is an arithmetic number, because the mean of its divisors is an integer number (28307927061).

Almost surely, 2^56615854121 is an apocalyptic number.

It is an amenable number.

56615854121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56615854121 is an equidigital number, since it uses as much as digits as its factorization.

56615854121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288000, while the sum is 44.

The spelling of 56615854121 in words is "fifty-six billion, six hundred fifteen million, eight hundred fifty-four thousand, one hundred twenty-one".