72172314523 has 4 divisors (see below), whose sum is σ = 72440613360. Its totient is φ = 71904015688.

The previous prime is 72172314493. The next prime is 72172314541. The reversal of 72172314523 is 32541327127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32541327127 = 5477 ⋅5941451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72172314523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72172314023) 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, 134149015 + ... + 134149552.

It is an arithmetic number, because the mean of its divisors is an integer number (18110153340).

Almost surely, 2^72172314523 is an apocalyptic number.

72172314523 is a deficient number, since it is larger than the sum of its proper divisors (268298837).

72172314523 is a wasteful number, since it uses less digits than its factorization.

72172314523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268298836.

The product of its digits is 70560, while the sum is 37.

The spelling of 72172314523 in words is "seventy-two billion, one hundred seventy-two million, three hundred fourteen thousand, five hundred twenty-three".