9638999961 has 8 divisors (see below), whose sum is σ = 13295172480. Its totient is φ = 6204413712.

The previous prime is 9638999917. The next prime is 9639000031. The reversal of 9638999961 is 1699998369.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9638999961 - 2¹⁸ = 9638737817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9638999261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55396465 + ... + 55396638.

It is an arithmetic number, because the mean of its divisors is an integer number (1661896560).

Almost surely, 2^9638999961 is an apocalyptic number.

It is an amenable number.

9638999961 is a deficient number, since it is larger than the sum of its proper divisors (3656172519).

9638999961 is a wasteful number, since it uses less digits than its factorization.

9638999961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110793135.

The product of its digits is 51018336, while the sum is 69.

The square root of 9638999961 is about 98178.4088331034. The cubic root of 9638999961 is about 2128.1912805549.

The spelling of 9638999961 in words is "nine billion, six hundred thirty-eight million, nine hundred ninety-nine thousand, nine hundred sixty-one".