56121068513 has 2 divisors, whose sum is σ = 56121068514. Its totient is φ = 56121068512.

The previous prime is 56121068477. The next prime is 56121068533. The reversal of 56121068513 is 31586012165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55501705744 + 619362769 = 235588^2 + 24887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56121068513 is a prime.

It is not a weakly prime, because it can be changed into another prime (56121068533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28060534256 + 28060534257.

It is an arithmetic number, because the mean of its divisors is an integer number (28060534257).

Almost surely, 2^56121068513 is an apocalyptic number.

It is an amenable number.

56121068513 is a deficient number, since it is larger than the sum of its proper divisors (1).

56121068513 is an equidigital number, since it uses as much as digits as its factorization.

56121068513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 56121068513 in words is "fifty-six billion, one hundred twenty-one million, sixty-eight thousand, five hundred thirteen".