6401325663 has 24 divisors (see below), whose sum is σ = 9759200880. Its totient is φ = 4032063360.

The previous prime is 6401325659. The next prime is 6401325709. The reversal of 6401325663 is 3665231046.

6401325663 is a `hidden beast` number, since 64 + 0 + 1 + 32 + 566 + 3 = 666.

It is not a de Polignac number, because 6401325663 - 2² = 6401325659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401345663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13603 + ... + 113963.

It is an arithmetic number, because the mean of its divisors is an integer number (406633370).

Almost surely, 2^6401325663 is an apocalyptic number.

6401325663 is a deficient number, since it is larger than the sum of its proper divisors (3357875217).

6401325663 is a wasteful number, since it uses less digits than its factorization.

6401325663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100759 (or 100756 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 6401325663 is about 80008.2849647460. The cubic root of 6401325663 is about 1856.7637158989.

It can be divided in two parts, 64013 and 25663, that added together give a triangular number (89676 = T₄₂₃).

The spelling of 6401325663 in words is "six billion, four hundred one million, three hundred twenty-five thousand, six hundred sixty-three".