991976718700 has 108 divisors (see below), whose sum is σ = 2366610542856. Its totient is φ = 360636320000.

The previous prime is 991976718697. The next prime is 991976718727. The reversal of 991976718700 is 7817679199.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 84052800 + ... + 84064600.

It is an arithmetic number, because the mean of its divisors is an integer number (21913060582).

Almost surely, 2^991976718700 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 991976718700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183305271428).

991976718700 is an abundant number, since it is smaller than the sum of its proper divisors (1374633824156).

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

991976718700 is a wasteful number, since it uses less digits than its factorization.

991976718700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18784 (or 18766 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 64.

The spelling of 991976718700 in words is "nine hundred ninety-one billion, nine hundred seventy-six million, seven hundred eighteen thousand, seven hundred".