9639649937 has 4 divisors (see below), whose sum is σ = 9667430256. Its totient is φ = 9611869620.

The previous prime is 9639649883. The next prime is 9639649939. The reversal of 9639649937 is 7399469369.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9639649937 - 2⁸ = 9639649681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9639649939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13889639 + ... + 13890332.

It is an arithmetic number, because the mean of its divisors is an integer number (2416857564).

Almost surely, 2^9639649937 is an apocalyptic number.

It is an amenable number.

9639649937 is a deficient number, since it is larger than the sum of its proper divisors (27780319).

9639649937 is a wasteful number, since it uses less digits than its factorization.

9639649937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780318.

The product of its digits is 59521392, while the sum is 65.

The square root of 9639649937 is about 98181.7189552108. The cubic root of 9639649937 is about 2128.2391154676.

The spelling of 9639649937 in words is "nine billion, six hundred thirty-nine million, six hundred forty-nine thousand, nine hundred thirty-seven".