72166007800 has 24 divisors (see below), whose sum is σ = 167785968600. Its totient is φ = 28866403040.

The previous prime is 72166007779. The next prime is 72166007807. The reversal of 72166007800 is 870066127.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 72166007800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72166007807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 180414820 + ... + 180415219.

It is an arithmetic number, because the mean of its divisors is an integer number (6991082025).

Almost surely, 2^72166007800 is an apocalyptic number.

It is an amenable number.

72166007800 is an abundant number, since it is smaller than the sum of its proper divisors (95619960800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72166007800 is a wasteful number, since it uses less digits than its factorization.

72166007800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360830055 (or 360830046 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 72166007800 in words is "seventy-two billion, one hundred sixty-six million, seven thousand, eight hundred".