9965615806 has 16 divisors (see below), whose sum is σ = 15166310400. Its totient is φ = 4910247160.

The previous prime is 9965615791. The next prime is 9965615827. The reversal of 9965615806 is 6085165699.

It is a super-4 number, since 4×9965615806⁴ (a number of 41 digits) contains 4444 as substring.

It is a congruent number.

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, 297495 + ... + 329293.

It is an arithmetic number, because the mean of its divisors is an integer number (947894400).

Almost surely, 2^9965615806 is an apocalyptic number.

9965615806 is a deficient number, since it is larger than the sum of its proper divisors (5200694594).

9965615806 is a wasteful number, since it uses less digits than its factorization.

9965615806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34079.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The square root of 9965615806 is about 99827.9309912812. The cubic root of 9965615806 is about 2151.9625711246.

The spelling of 9965615806 in words is "nine billion, nine hundred sixty-five million, six hundred fifteen thousand, eight hundred six".