72166572645 has 32 divisors (see below), whose sum is σ = 120679614720. Its totient is φ = 36778506240.

The previous prime is 72166572637. The next prime is 72166572649. The reversal of 72166572645 is 54627566127.

It is not a de Polignac number, because 72166572645 - 2³ = 72166572637 is a prime.

It is a Curzon number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 812961 + ... + 897350.

It is an arithmetic number, because the mean of its divisors is an integer number (3771237960).

Almost surely, 2^72166572645 is an apocalyptic number.

It is an amenable number.

72166572645 is a deficient number, since it is larger than the sum of its proper divisors (48513042075).

72166572645 is a wasteful number, since it uses less digits than its factorization.

72166572645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710445.

The product of its digits is 4233600, while the sum is 51.

The spelling of 72166572645 in words is "seventy-two billion, one hundred sixty-six million, five hundred seventy-two thousand, six hundred forty-five".