6399422685 has 48 divisors (see below), whose sum is σ = 11470939200. Its totient is φ = 3384999072.

The previous prime is 6399422677. The next prime is 6399422707. The reversal of 6399422685 is 5862249936.

It is a happy number.

It is not a de Polignac number, because 6399422685 - 2³ = 6399422677 is a prime.

It is a super-2 number, since 2×6399422685² = 81905221402585218450, which contains 22 as substring.

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, 2175946 + ... + 2178884.

It is an arithmetic number, because the mean of its divisors is an integer number (238977900).

Almost surely, 2^6399422685 is an apocalyptic number.

It is an amenable number.

6399422685 is a deficient number, since it is larger than the sum of its proper divisors (5071516515).

6399422685 is a wasteful number, since it uses less digits than its factorization.

6399422685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207 (or 3074 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 6399422685 is about 79996.3916998761. The cubic root of 6399422685 is about 1856.5797055402.

The spelling of 6399422685 in words is "six billion, three hundred ninety-nine million, four hundred twenty-two thousand, six hundred eighty-five".