72189797925 has 96 divisors (see below), whose sum is σ = 138162585600. Its totient is φ = 32576924160.

The previous prime is 72189797921. The next prime is 72189797993. The reversal of 72189797925 is 52979798127.

It is not a de Polignac number, because 72189797925 - 2² = 72189797921 is a prime.

It is a super-2 number, since 2×72189797925² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72189797921) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 48546532 + ... + 48548018.

It is an arithmetic number, because the mean of its divisors is an integer number (1439193600).

Almost surely, 2^72189797925 is an apocalyptic number.

72189797925 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

72189797925 is a deficient number, since it is larger than the sum of its proper divisors (65972787675).

72189797925 is a wasteful number, since it uses less digits than its factorization.

72189797925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635 (or 2630 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 66.

The spelling of 72189797925 in words is "seventy-two billion, one hundred eighty-nine million, seven hundred ninety-seven thousand, nine hundred twenty-five".