999956798120 has 32 divisors (see below), whose sum is σ = 2571317481600. Its totient is φ = 342842330688.

The previous prime is 999956798119. The next prime is 999956798143. The reversal of 999956798120 is 21897659999.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785636860 + ... + 1785637419.

It is an arithmetic number, because the mean of its divisors is an integer number (80353671300).

Almost surely, 2^999956798120 is an apocalyptic number.

It is an amenable number.

999956798120 is an abundant number, since it is smaller than the sum of its proper divisors (1571360683480).

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

999956798120 is a wasteful number, since it uses less digits than its factorization.

999956798120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571274297 (or 3571274293 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 74.

The spelling of 999956798120 in words is "nine hundred ninety-nine billion, nine hundred fifty-six million, seven hundred ninety-eight thousand, one hundred twenty".