72170115261 has 16 divisors (see below), whose sum is σ = 101297227200. Its totient is φ = 45578498688.

The previous prime is 72170115257. The next prime is 72170115319. The reversal of 72170115261 is 16251107127.

It is not a de Polignac number, because 72170115261 - 2² = 72170115257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72170115361) 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, 1598185 + ... + 1642721.

It is an arithmetic number, because the mean of its divisors is an integer number (6331076700).

Almost surely, 2^72170115261 is an apocalyptic number.

It is an amenable number.

72170115261 is a deficient number, since it is larger than the sum of its proper divisors (29127111939).

72170115261 is a wasteful number, since it uses less digits than its factorization.

72170115261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72988.

The product of its (nonzero) digits is 5880, while the sum is 33.

The spelling of 72170115261 in words is "seventy-two billion, one hundred seventy million, one hundred fifteen thousand, two hundred sixty-one".