990661035606 has 96 divisors (see below), whose sum is σ = 2214599589888. Its totient is φ = 295134840000.

The previous prime is 990661035523. The next prime is 990661035619. The reversal of 990661035606 is 606530166099.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120940971 + ... + 120949161.

It is an arithmetic number, because the mean of its divisors is an integer number (23068745728).

Almost surely, 2^990661035606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990661035606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107299794944).

990661035606 is an abundant number, since it is smaller than the sum of its proper divisors (1223938554282).

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

990661035606 is a wasteful number, since it uses less digits than its factorization.

990661035606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010 (or 10999 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 51.

The spelling of 990661035606 in words is "nine hundred ninety billion, six hundred sixty-one million, thirty-five thousand, six hundred six".