6401808366 has 16 divisors (see below), whose sum is σ = 12820857984. Its totient is φ = 2131062584.

The previous prime is 6401808349. The next prime is 6401808379. The reversal of 6401808366 is 6638081046.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713556 + ... + 722471.

It is an arithmetic number, because the mean of its divisors is an integer number (801303624).

Almost surely, 2^6401808366 is an apocalyptic number.

6401808366 is an abundant number, since it is smaller than the sum of its proper divisors (6419049618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6401808366 is a wasteful number, since it uses less digits than its factorization.

6401808366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436775.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 6401808366 is about 80011.3014892271. The cubic root of 6401808366 is about 1856.8103855491.

The spelling of 6401808366 in words is "six billion, four hundred one million, eight hundred eight thousand, three hundred sixty-six".