72317075643 has 10 divisors (see below), whose sum is σ = 108029211884. Its totient is φ = 48211383708.

The previous prime is 72317075539. The next prime is 72317075671. The reversal of 72317075643 is 34657071327.

72317075643 is a `hidden beast` number, since 72 + 3 + 17 + 0 + 7 + 564 + 3 = 666.

It is not a de Polignac number, because 72317075643 - 2²⁹ = 71780204731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72317075443) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 446401621 + ... + 446401782.

Almost surely, 2^72317075643 is an apocalyptic number.

72317075643 is a deficient number, since it is larger than the sum of its proper divisors (35712136241).

72317075643 is an equidigital number, since it uses as much as digits as its factorization.

72317075643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892803415 (or 892803406 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The spelling of 72317075643 in words is "seventy-two billion, three hundred seventeen million, seventy-five thousand, six hundred forty-three".