990919000066 has 16 divisors (see below), whose sum is σ = 1491083445600. Its totient is φ = 493893023008.

The previous prime is 990919000063. The next prime is 990919000079. The reversal of 990919000066 is 660000919099.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 990918999983 and 990919000019.

It is not an unprimeable number, because it can be changed into a prime (990919000063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621501 + ... + 1538863.

It is an arithmetic number, because the mean of its divisors is an integer number (93192715350).

Almost surely, 2^990919000066 is an apocalyptic number.

990919000066 is a deficient number, since it is larger than the sum of its proper divisors (500164445534).

990919000066 is a wasteful number, since it uses less digits than its factorization.

990919000066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919073.

The product of its (nonzero) digits is 236196, while the sum is 49.

The spelling of 990919000066 in words is "nine hundred ninety billion, nine hundred nineteen million, sixty-six", and thus it is an aban number.