72161020779 has 8 divisors (see below), whose sum is σ = 96215941632. Its totient is φ = 48106723560.

The previous prime is 72161020703. The next prime is 72161020817. The reversal of 72161020779 is 97702016127.

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

It is not a de Polignac number, because 72161020779 - 2²⁵ = 72127466347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72161020779.

It is not an unprimeable number, because it can be changed into a prime (72161020879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334062 + ... + 505884.

It is an arithmetic number, because the mean of its divisors is an integer number (12026992704).

Almost surely, 2^72161020779 is an apocalyptic number.

72161020779 is a deficient number, since it is larger than the sum of its proper divisors (24054920853).

72161020779 is a wasteful number, since it uses less digits than its factorization.

72161020779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311817.

The product of its (nonzero) digits is 74088, while the sum is 42.

The spelling of 72161020779 in words is "seventy-two billion, one hundred sixty-one million, twenty thousand, seven hundred seventy-nine".