72899597181 has 4 divisors (see below), whose sum is σ = 97199462912. Its totient is φ = 48599731452.

The previous prime is 72899597161. The next prime is 72899597201. The reversal of 72899597181 is 18179599827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (72899597161) and next prime (72899597201).

It is not a de Polignac number, because 72899597181 - 2¹⁸ = 72899335037 is a prime.

It is a super-2 number, since 2×72899597181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72899597161) 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, 12149932861 + ... + 12149932866.

It is an arithmetic number, because the mean of its divisors is an integer number (24299865728).

Almost surely, 2^72899597181 is an apocalyptic number.

It is an amenable number.

72899597181 is a deficient number, since it is larger than the sum of its proper divisors (24299865731).

72899597181 is a wasteful number, since it uses less digits than its factorization.

72899597181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24299865730.

The product of its digits is 22861440, while the sum is 66.

The spelling of 72899597181 in words is "seventy-two billion, eight hundred ninety-nine million, five hundred ninety-seven thousand, one hundred eighty-one".