72499513945 has 8 divisors (see below), whose sum is σ = 87003166536. Its totient is φ = 57997111296.

The previous prime is 72499513909. The next prime is 72499513973. The reversal of 72499513945 is 54931599427.

It can be written as a sum of positive squares in 4 ways, for example, as 19457739081 + 53041774864 = 139491^2 + 230308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72499513945 is a prime.

It is a super-2 number, since 2×72499513945² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72499513945.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 179752 + ... + 421081.

It is an arithmetic number, because the mean of its divisors is an integer number (10875395817).

Almost surely, 2^72499513945 is an apocalyptic number.

It is an amenable number.

72499513945 is a deficient number, since it is larger than the sum of its proper divisors (14503652591).

72499513945 is a wasteful number, since it uses less digits than its factorization.

72499513945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624971.

The product of its digits is 12247200, while the sum is 58.

The spelling of 72499513945 in words is "seventy-two billion, four hundred ninety-nine million, five hundred thirteen thousand, nine hundred forty-five".