991162656 has 120 divisors (see below), whose sum is σ = 3180071664. Its totient is φ = 300343680.

The previous prime is 991162643. The next prime is 991162673. The reversal of 991162656 is 656261199.

It is a happy number.

991162656 is a `hidden beast` number, since 9 + 9 + 11 + 626 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11131 + ... + 45893.

Almost surely, 2^991162656 is an apocalyptic number.

991162656 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991162656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590035832).

991162656 is an abundant number, since it is smaller than the sum of its proper divisors (2188909008).

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

991162656 is a wasteful number, since it uses less digits than its factorization.

991162656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34796 (or 34779 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 991162656 is about 31482.7358404571. The cubic root of 991162656 is about 997.0454981824.

The spelling of 991162656 in words is "nine hundred ninety-one million, one hundred sixty-two thousand, six hundred fifty-six".