9661002090 has 16 divisors (see below), whose sum is σ = 23186405088. Its totient is φ = 2576267216.

The previous prime is 9661002047. The next prime is 9661002103. The reversal of 9661002090 is 902001669.

It is a happy number.

9661002090 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×9661002090² (a number of 21 digits) contains 22 as substring.

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, 161016672 + ... + 161016731.

It is an arithmetic number, because the mean of its divisors is an integer number (1449150318).

Almost surely, 2^9661002090 is an apocalyptic number.

9661002090 is an abundant number, since it is smaller than the sum of its proper divisors (13525402998).

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

9661002090 is a wasteful number, since it uses less digits than its factorization.

9661002090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322033413.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 9661002090 is about 98290.3967333534. The cubic root of 9661002090 is about 2129.8093307251.

The spelling of 9661002090 in words is "nine billion, six hundred sixty-one million, two thousand, ninety".