72487615664689 has 2 divisors, whose sum is σ = 72487615664690. Its totient is φ = 72487615664688.

The previous prime is 72487615664603. The next prime is 72487615664759. The reversal of 72487615664689 is 98646651678427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61160298455025 + 11327317209664 = 7820505^2 + 3365608^2 .

It is a cyclic number.

It is not a de Polignac number, because 72487615664689 - 2¹⁷ = 72487615533617 is a prime.

It is not a weakly prime, because it can be changed into another prime (72487615661689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36243807832344 + 36243807832345.

It is an arithmetic number, because the mean of its divisors is an integer number (36243807832345).

Almost surely, 2^{72487615664689} is an apocalyptic number.

It is an amenable number.

72487615664689 is a deficient number, since it is larger than the sum of its proper divisors (1).

72487615664689 is an equidigital number, since it uses as much as digits as its factorization.

72487615664689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5852528640, while the sum is 79.

The spelling of 72487615664689 in words is "seventy-two trillion, four hundred eighty-seven billion, six hundred fifteen million, six hundred sixty-four thousand, six hundred eighty-nine".