72170906672 has 10 divisors (see below), whose sum is σ = 139831131708. Its totient is φ = 36085453328.

The previous prime is 72170906657. The next prime is 72170906681. The reversal of 72170906672 is 27660907127.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255340818 + ... + 2255340849.

Almost surely, 2^72170906672 is an apocalyptic number.

It is an amenable number.

72170906672 is a deficient number, since it is larger than the sum of its proper divisors (67660225036).

72170906672 is a wasteful number, since it uses less digits than its factorization.

72170906672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510681675 (or 4510681669 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 72170906672 in words is "seventy-two billion, one hundred seventy million, nine hundred six thousand, six hundred seventy-two".