72511516779 has 16 divisors (see below), whose sum is σ = 105437068800. Its totient is φ = 44057628576.

The previous prime is 72511516771. The next prime is 72511516793. The reversal of 72511516779 is 97761511527.

It is not a de Polignac number, because 72511516779 - 2³ = 72511516771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72511516771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11764449 + ... + 11770610.

It is an arithmetic number, because the mean of its divisors is an integer number (6589816800).

Almost surely, 2^72511516779 is an apocalyptic number.

72511516779 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

72511516779 is a deficient number, since it is larger than the sum of its proper divisors (32925552021).

72511516779 is a wasteful number, since it uses less digits than its factorization.

72511516779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23535154.

The product of its digits is 926100, while the sum is 51.

The spelling of 72511516779 in words is "seventy-two billion, five hundred eleven million, five hundred sixteen thousand, seven hundred seventy-nine".