72399820171 has 8 divisors (see below), whose sum is σ = 82767079424. Its totient is φ = 62038667880.

The previous prime is 72399820091. The next prime is 72399820211. The reversal of 72399820171 is 17102899327.

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

It is not a de Polignac number, because 72399820171 - 2²¹ = 72397723019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72399820271) 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, 1501305 + ... + 1548778.

It is an arithmetic number, because the mean of its divisors is an integer number (10345884928).

Almost surely, 2^72399820171 is an apocalyptic number.

72399820171 is a deficient number, since it is larger than the sum of its proper divisors (10367259253).

72399820171 is a wasteful number, since it uses less digits than its factorization.

72399820171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053481.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 72399820171 in words is "seventy-two billion, three hundred ninety-nine million, eight hundred twenty thousand, one hundred seventy-one".