9965661290 has 48 divisors (see below), whose sum is σ = 20566853208. Its totient is φ = 3463170048.

The previous prime is 9965661281. The next prime is 9965661319. The reversal of 9965661290 is 921665699.

It can be written as a sum of positive squares in 12 ways, for example, as 1440278401 + 8525382889 = 37951^2 + 92333^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144707 + ... + 202166.

Almost surely, 2^9965661290 is an apocalyptic number.

9965661290 is an abundant number, since it is smaller than the sum of its proper divisors (10601191918).

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

9965661290 is a wasteful number, since it uses less digits than its factorization.

9965661290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346923 (or 346910 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 9965661290 is about 99828.1588030151. The cubic root of 9965661290 is about 2151.9658450389.

The spelling of 9965661290 in words is "nine billion, nine hundred sixty-five million, six hundred sixty-one thousand, two hundred ninety".