72131751523 has 4 divisors (see below), whose sum is σ = 77680347808. Its totient is φ = 66583155240.

The previous prime is 72131751511. The next prime is 72131751547. The reversal of 72131751523 is 32515713127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32515713127 = 173 ⋅187952099.

It is a cyclic number.

It is not a de Polignac number, because 72131751523 - 2⁵ = 72131751491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72131752523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2774298123 + ... + 2774298148.

It is an arithmetic number, because the mean of its divisors is an integer number (19420086952).

Almost surely, 2^72131751523 is an apocalyptic number.

72131751523 is a deficient number, since it is larger than the sum of its proper divisors (5548596285).

72131751523 is a wasteful number, since it uses less digits than its factorization.

72131751523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5548596284.

The product of its digits is 44100, while the sum is 37.

The spelling of 72131751523 in words is "seventy-two billion, one hundred thirty-one million, seven hundred fifty-one thousand, five hundred twenty-three".