72166572659 has 8 divisors (see below), whose sum is σ = 72529959168. Its totient is φ = 71803585480.

The previous prime is 72166572649. The next prime is 72166572661. The reversal of 72166572659 is 95627566127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72166572659 - 2²⁰ = 72165524083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72166572649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265874 + ... + 463704.

It is an arithmetic number, because the mean of its divisors is an integer number (9066244896).

Almost surely, 2^72166572659 is an apocalyptic number.

72166572659 is a deficient number, since it is larger than the sum of its proper divisors (363386509).

72166572659 is a wasteful number, since it uses less digits than its factorization.

72166572659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199665.

The product of its digits is 9525600, while the sum is 56.

The spelling of 72166572659 in words is "seventy-two billion, one hundred sixty-six million, five hundred seventy-two thousand, six hundred fifty-nine".