72501902221 has 8 divisors (see below), whose sum is σ = 83252016704. Its totient is φ = 61849962720.

The previous prime is 72501902219. The next prime is 72501902269. The reversal of 72501902221 is 12220910527.

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

It is not a de Polignac number, because 72501902221 - 2¹ = 72501902219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72501902281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24542160 + ... + 24545113.

It is an arithmetic number, because the mean of its divisors is an integer number (10406502088).

Almost surely, 2^72501902221 is an apocalyptic number.

It is an amenable number.

72501902221 is a deficient number, since it is larger than the sum of its proper divisors (10750114483).

72501902221 is a wasteful number, since it uses less digits than its factorization.

72501902221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49087491.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 72501902221 in words is "seventy-two billion, five hundred one million, nine hundred two thousand, two hundred twenty-one".