6400063971 has 48 divisors (see below), whose sum is σ = 10837322496. Its totient is φ = 3563396928.

The previous prime is 6400063951. The next prime is 6400063991. The reversal of 6400063971 is 1793600046.

6400063971 is a `hidden beast` number, since 640 + 0 + 0 + 6 + 3 + 9 + 7 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (6400063951) and next prime (6400063991).

It is not a de Polignac number, because 6400063971 - 2⁷ = 6400063843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6400063951) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1197421 + ... + 1202753.

It is an arithmetic number, because the mean of its divisors is an integer number (225777552).

Almost surely, 2^6400063971 is an apocalyptic number.

6400063971 is a deficient number, since it is larger than the sum of its proper divisors (4437258525).

6400063971 is a wasteful number, since it uses less digits than its factorization.

6400063971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832 (or 5829 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 6400063971 is about 80000.3998177509. The cubic root of 6400063971 is about 1856.6417194053.

The spelling of 6400063971 in words is "six billion, four hundred million, sixty-three thousand, nine hundred seventy-one".