990509078916 has 72 divisors (see below), whose sum is σ = 2861609063040. Its totient is φ = 282988907136.

The previous prime is 990509078899. The next prime is 990509078941. The reversal of 990509078916 is 619870905099.

990509078916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×990509078916² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5866225 + ... + 6032711.

It is an arithmetic number, because the mean of its divisors is an integer number (39744570320).

Almost surely, 2^990509078916 is an apocalyptic number.

It is an amenable number.

990509078916 is an abundant number, since it is smaller than the sum of its proper divisors (1871099984124).

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

990509078916 is a wasteful number, since it uses less digits than its factorization.

990509078916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190113 (or 190108 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 63.

The spelling of 990509078916 in words is "nine hundred ninety billion, five hundred nine million, seventy-eight thousand, nine hundred sixteen".