72220482161 has 4 divisors (see below), whose sum is σ = 72229101552. Its totient is φ = 72211862772.

The previous prime is 72220482157. The next prime is 72220482167. The reversal of 72220482161 is 16128402227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72220482161 - 2² = 72220482157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72220482167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4297115 + ... + 4313888.

It is an arithmetic number, because the mean of its divisors is an integer number (18057275388).

Almost surely, 2^72220482161 is an apocalyptic number.

It is an amenable number.

72220482161 is a deficient number, since it is larger than the sum of its proper divisors (8619391).

72220482161 is an equidigital number, since it uses as much as digits as its factorization.

72220482161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8619390.

The product of its (nonzero) digits is 21504, while the sum is 35.

Adding to 72220482161 its reverse (16128402227), we get a palindrome (88348884388).

The spelling of 72220482161 in words is "seventy-two billion, two hundred twenty million, four hundred eighty-two thousand, one hundred sixty-one".