7991222160 has 160 divisors (see below), whose sum is σ = 26918277120. Its totient is φ = 1953676800.

The previous prime is 7991222089. The next prime is 7991222167. The reversal of 7991222160 is 612221997.

It is a super-2 number, since 2×7991222160² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7991222167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113095 + ... + 169625.

It is an arithmetic number, because the mean of its divisors is an integer number (168239232).

Almost surely, 2^7991222160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7991222160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13459138560).

7991222160 is an abundant number, since it is smaller than the sum of its proper divisors (18927054960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7991222160 is a wasteful number, since it uses less digits than its factorization.

7991222160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56597 (or 56591 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 7991222160 is about 89393.6360150990. The cubic root of 7991222160 is about 1999.2682456338.

The spelling of 7991222160 in words is "seven billion, nine hundred ninety-one million, two hundred twenty-two thousand, one hundred sixty".