990939063751 has 24 divisors (see below), whose sum is σ = 1264818802464. Its totient is φ = 769246470720.

The previous prime is 990939063743. The next prime is 990939063757. The reversal of 990939063751 is 157360939099.

990939063751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990939063751 - 2³ = 990939063743 is a prime.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 990939063751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990939063757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14642035 + ... + 14709556.

It is an arithmetic number, because the mean of its divisors is an integer number (52700783436).

Almost surely, 2^990939063751 is an apocalyptic number.

990939063751 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

990939063751 is a deficient number, since it is larger than the sum of its proper divisors (273879738713).

990939063751 is a wasteful number, since it uses less digits than its factorization.

990939063751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29351671 (or 29351664 counting only the distinct ones).

The product of its (nonzero) digits is 12400290, while the sum is 61.

The spelling of 990939063751 in words is "nine hundred ninety billion, nine hundred thirty-nine million, sixty-three thousand, seven hundred fifty-one".