72701565637 has 2 divisors, whose sum is σ = 72701565638. Its totient is φ = 72701565636.

The previous prime is 72701565619. The next prime is 72701565647. The reversal of 72701565637 is 73656510727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56887497121 + 15814068516 = 238511^2 + 125754^2 .

It is an emirp because it is prime and its reverse (73656510727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72701565637 - 2³⁵ = 38341827269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72701565617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36350782818 + 36350782819.

It is an arithmetic number, because the mean of its divisors is an integer number (36350782819).

Almost surely, 2^72701565637 is an apocalyptic number.

It is an amenable number.

72701565637 is a deficient number, since it is larger than the sum of its proper divisors (1).

72701565637 is an equidigital number, since it uses as much as digits as its factorization.

72701565637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1852200, while the sum is 49.

The spelling of 72701565637 in words is "seventy-two billion, seven hundred one million, five hundred sixty-five thousand, six hundred thirty-seven".