72805164931 has 4 divisors (see below), whose sum is σ = 72964476472. Its totient is φ = 72645853392.

The previous prime is 72805164907. The next prime is 72805164947. The reversal of 72805164931 is 13946150827.

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 72805164931 - 2¹⁵ = 72805132163 is a prime.

It is a super-2 number, since 2×72805164931² (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 (72805164331) 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, 79655085 + ... + 79655998.

It is an arithmetic number, because the mean of its divisors is an integer number (18241119118).

It is a 1-persistent number, because it is pandigital, but 2⋅72805164931 = 145610329862 is not.

Almost surely, 2^72805164931 is an apocalyptic number.

72805164931 is a deficient number, since it is larger than the sum of its proper divisors (159311541).

72805164931 is a wasteful number, since it uses less digits than its factorization.

72805164931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159311540.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 72805164931 in words is "seventy-two billion, eight hundred five million, one hundred sixty-four thousand, nine hundred thirty-one".