51556522565531 has 2 divisors, whose sum is σ = 51556522565532. Its totient is φ = 51556522565530.

The previous prime is 51556522565501. The next prime is 51556522565573. The reversal of 51556522565531 is 13556522565515.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51556522565531 is a prime.

It is a super-2 number, since 2×51556522565531² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51556522565501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778261282765 + 25778261282766.

It is an arithmetic number, because the mean of its divisors is an integer number (25778261282766).

Almost surely, 2^{51556522565531} is an apocalyptic number.

51556522565531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51556522565531 is an equidigital number, since it uses as much as digits as its factorization.

51556522565531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33750000, while the sum is 56.

The spelling of 51556522565531 in words is "fifty-one trillion, five hundred fifty-six billion, five hundred twenty-two million, five hundred sixty-five thousand, five hundred thirty-one".