72517756523 has 4 divisors (see below), whose sum is σ = 72518373480. Its totient is φ = 72517139568.

The previous prime is 72517756501. The next prime is 72517756547. The reversal of 72517756523 is 32565771527.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72517756523 - 2³⁰ = 71444014699 is a prime.

It is a super-2 number, since 2×72517756523² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72517756573) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 71465 + ... + 387482.

It is an arithmetic number, because the mean of its divisors is an integer number (18129593370).

Almost surely, 2^72517756523 is an apocalyptic number.

72517756523 is a deficient number, since it is larger than the sum of its proper divisors (616957).

72517756523 is a wasteful number, since it uses less digits than its factorization.

72517756523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616956.

The product of its digits is 3087000, while the sum is 50.

The spelling of 72517756523 in words is "seventy-two billion, five hundred seventeen million, seven hundred fifty-six thousand, five hundred twenty-three".