6381643995 has 32 divisors (see below), whose sum is σ = 11367820800. Its totient is φ = 3396740832.

The previous prime is 6381643987. The next prime is 6381644023. The reversal of 6381643995 is 5993461836.

It is not a de Polignac number, because 6381643995 - 2³ = 6381643987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20916 + ... + 114894.

It is an arithmetic number, because the mean of its divisors is an integer number (355244400).

Almost surely, 2^6381643995 is an apocalyptic number.

6381643995 is a deficient number, since it is larger than the sum of its proper divisors (4986176805).

6381643995 is a wasteful number, since it uses less digits than its factorization.

6381643995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94496 (or 94490 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 6381643995 is about 79885.1925891150. The cubic root of 6381643995 is about 1854.8588123278.

The spelling of 6381643995 in words is "six billion, three hundred eighty-one million, six hundred forty-three thousand, nine hundred ninety-five".