9090866660 has 24 divisors (see below), whose sum is σ = 19352341176. Its totient is φ = 3586533120.

The previous prime is 9090866657. The next prime is 9090866677. The reversal of 9090866660 is 666680909.

It can be written as a sum of positive squares in 4 ways, for example, as 229280164 + 8861586496 = 15142^2 + 94136^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9090866599 and 9090866608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3111851 + ... + 3114770.

It is an arithmetic number, because the mean of its divisors is an integer number (806347549).

Almost surely, 2^9090866660 is an apocalyptic number.

It is an amenable number.

9090866660 is an abundant number, since it is smaller than the sum of its proper divisors (10261474516).

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

9090866660 is a wasteful number, since it uses less digits than its factorization.

9090866660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226703 (or 6226701 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 9090866660 is about 95346.0364147351. The cubic root of 9090866660 is about 2087.0607753640.

The spelling of 9090866660 in words is "nine billion, ninety million, eight hundred sixty-six thousand, six hundred sixty".