56538746881 has 2 divisors, whose sum is σ = 56538746882. Its totient is φ = 56538746880.

The previous prime is 56538746819. The next prime is 56538746893. The reversal of 56538746881 is 18864783565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56161416256 + 377330625 = 236984^2 + 19425^2 .

It is a cyclic number.

It is not a de Polignac number, because 56538746881 - 2²³ = 56530358273 is a prime.

It is a super-2 number, since 2×56538746881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56538746801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28269373440 + 28269373441.

It is an arithmetic number, because the mean of its divisors is an integer number (28269373441).

Almost surely, 2^56538746881 is an apocalyptic number.

It is an amenable number.

56538746881 is a deficient number, since it is larger than the sum of its proper divisors (1).

56538746881 is an equidigital number, since it uses as much as digits as its factorization.

56538746881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38707200, while the sum is 61.

The spelling of 56538746881 in words is "fifty-six billion, five hundred thirty-eight million, seven hundred forty-six thousand, eight hundred eighty-one".