72165299420 has 24 divisors (see below), whose sum is σ = 151597586448. Its totient is φ = 28856508800.

The previous prime is 72165299417. The next prime is 72165299431. The reversal of 72165299420 is 2499256127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 538961 + ... + 659400.

It is an arithmetic number, because the mean of its divisors is an integer number (6316566102).

Almost surely, 2^72165299420 is an apocalyptic number.

It is an amenable number.

72165299420 is an abundant number, since it is smaller than the sum of its proper divisors (79432287028).

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

72165299420 is a wasteful number, since it uses less digits than its factorization.

72165299420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201381 (or 1201379 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 72165299420 in words is "seventy-two billion, one hundred sixty-five million, two hundred ninety-nine thousand, four hundred twenty".