6399885965 has 8 divisors (see below), whose sum is σ = 8378032608. Its totient is φ = 4654462480.

The previous prime is 6399885941. The next prime is 6399885979. The reversal of 6399885965 is 5695889936.

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

It is not a de Polignac number, because 6399885965 - 2⁶ = 6399885901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6399885895 and 6399885904.

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, 58180727 + ... + 58180836.

It is an arithmetic number, because the mean of its divisors is an integer number (1047254076).

Almost surely, 2^6399885965 is an apocalyptic number.

It is an amenable number.

6399885965 is a deficient number, since it is larger than the sum of its proper divisors (1978146643).

6399885965 is a wasteful number, since it uses less digits than its factorization.

6399885965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116361579.

The product of its digits is 125971200, while the sum is 68.

The square root of 6399885965 is about 79999.2872780752. The cubic root of 6399885965 is about 1856.6245062216.

The spelling of 6399885965 in words is "six billion, three hundred ninety-nine million, eight hundred eighty-five thousand, nine hundred sixty-five".