6378646131 has 64 divisors (see below), whose sum is σ = 11128320000. Its totient is φ = 3559991040.

The previous prime is 6378646121. The next prime is 6378646181. The reversal of 6378646131 is 1316468736.

6378646131 is a `hidden beast` number, since 637 + 8 + 6 + 4 + 6 + 1 + 3 + 1 = 666.

It is not a de Polignac number, because 6378646131 - 2⁶ = 6378646067 is a prime.

It is a super-2 number, since 2×6378646131² = 81374252929042538322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6378646111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1847695 + ... + 1851143.

It is an arithmetic number, because the mean of its divisors is an integer number (173880000).

Almost surely, 2^6378646131 is an apocalyptic number.

6378646131 is a deficient number, since it is larger than the sum of its proper divisors (4749673869).

6378646131 is a wasteful number, since it uses less digits than its factorization.

6378646131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961 (or 3955 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 6378646131 is about 79866.4268075141. The cubic root of 6378646131 is about 1854.5683184563.

The spelling of 6378646131 in words is "six billion, three hundred seventy-eight million, six hundred forty-six thousand, one hundred thirty-one".