72536555257 has 2 divisors, whose sum is σ = 72536555258. Its totient is φ = 72536555256.

The previous prime is 72536555239. The next prime is 72536555363. The reversal of 72536555257 is 75255563527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71470140921 + 1066414336 = 267339^2 + 32656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72536555257 is a prime.

It is not a weakly prime, because it can be changed into another prime (72536555057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36268277628 + 36268277629.

It is an arithmetic number, because the mean of its divisors is an integer number (36268277629).

Almost surely, 2^72536555257 is an apocalyptic number.

It is an amenable number.

72536555257 is a deficient number, since it is larger than the sum of its proper divisors (1).

72536555257 is an equidigital number, since it uses as much as digits as its factorization.

72536555257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11025000, while the sum is 52.

The spelling of 72536555257 in words is "seventy-two billion, five hundred thirty-six million, five hundred fifty-five thousand, two hundred fifty-seven".