9999637965 has 48 divisors (see below), whose sum is σ = 18267674880. Its totient is φ = 5046157440.

The previous prime is 9999637937. The next prime is 9999637981. The reversal of 9999637965 is 5697369999.

It is not a de Polignac number, because 9999637965 - 2¹⁴ = 9999621581 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9999637893 and 9999637902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 722460 + ... + 736170.

It is an arithmetic number, because the mean of its divisors is an integer number (380576560).

Almost surely, 2^9999637965 is an apocalyptic number.

9999637965 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9999637965 is a deficient number, since it is larger than the sum of its proper divisors (8268036915).

9999637965 is a wasteful number, since it uses less digits than its factorization.

9999637965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14594 (or 14591 counting only the distinct ones).

The product of its digits is 223205220, while the sum is 72.

The square root of 9999637965 is about 99998.1898086160. The cubic root of 9999637965 is about 2154.4086903594.

The spelling of 9999637965 in words is "nine billion, nine hundred ninety-nine million, six hundred thirty-seven thousand, nine hundred sixty-five".