72517273156631 has 4 divisors (see below), whose sum is σ = 73235265960264. Its totient is φ = 71799280353000.

The previous prime is 72517273156609. The next prime is 72517273156661. The reversal of 72517273156631 is 13665137271527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72517273156631 - 2¹⁸ = 72517272894487 is a prime.

It is a super-2 number, since 2×72517273156631² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72517273156661) 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, 358996401665 + ... + 358996401866.

It is an arithmetic number, because the mean of its divisors is an integer number (18308816490066).

Almost surely, 2^{72517273156631} is an apocalyptic number.

72517273156631 is a deficient number, since it is larger than the sum of its proper divisors (717992803633).

72517273156631 is a wasteful number, since it uses less digits than its factorization.

72517273156631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717992803632.

The product of its digits is 11113200, while the sum is 56.

The spelling of 72517273156631 in words is "seventy-two trillion, five hundred seventeen billion, two hundred seventy-three million, one hundred fifty-six thousand, six hundred thirty-one".