72220317081891 has 8 divisors (see below), whose sum is σ = 105047733937344. Its totient is φ = 43769889140520.

The previous prime is 72220317081793. The next prime is 72220317081943. The reversal of 72220317081891 is 19818071302227.

It is a happy number.

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

It is not a de Polignac number, because 72220317081891 - 2¹¹ = 72220317079843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72220317086891) 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, 1094247228481 + ... + 1094247228546.

It is an arithmetic number, because the mean of its divisors is an integer number (13130966742168).

Almost surely, 2^{72220317081891} is an apocalyptic number.

72220317081891 is a deficient number, since it is larger than the sum of its proper divisors (32827416855453).

72220317081891 is a wasteful number, since it uses less digits than its factorization.

72220317081891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188494457041.

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 72220317081891 in words is "seventy-two trillion, two hundred twenty billion, three hundred seventeen million, eighty-one thousand, eight hundred ninety-one".