990659911761 has 135 divisors (see below), whose sum is σ = 1646384108193. Its totient is φ = 593369375040.

The previous prime is 990659911751. The next prime is 990659911831. The reversal of 990659911761 is 167119956099.

The square root of 990659911761 is 995319.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 762993515025 + 227666396736 = 873495^2 + 477144^2 .

It is not a de Polignac number, because 990659911761 - 2⁵ = 990659911729 is a prime.

It is a super-2 number, since 2×990659911761² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990659911751) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 5473259091 + ... + 5473259271.

Almost surely, 2^990659911761 is an apocalyptic number.

990659911761 is the 995319-th square number.

990659911761 is the 497660-th centered octagonal number.

It is an amenable number.

990659911761 is a deficient number, since it is larger than the sum of its proper divisors (655724196432).

990659911761 is an equidigital number, since it uses as much as digits as its factorization.

990659911761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 8266860, while the sum is 63.

The spelling of 990659911761 in words is "nine hundred ninety billion, six hundred fifty-nine million, nine hundred eleven thousand, seven hundred sixty-one".