6404631355 has 4 divisors (see below), whose sum is σ = 7685557632. Its totient is φ = 5123705080.

The previous prime is 6404631349. The next prime is 6404631367. The reversal of 6404631355 is 5531364046.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6404631355 - 2⁷ = 6404631227 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640463131 + ... + 640463140.

It is an arithmetic number, because the mean of its divisors is an integer number (1921389408).

Almost surely, 2^6404631355 is an apocalyptic number.

6404631355 is a deficient number, since it is larger than the sum of its proper divisors (1280926277).

6404631355 is a wasteful number, since it uses less digits than its factorization.

6404631355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280926276.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 6404631355 is about 80028.9407339620. The cubic root of 6404631355 is about 1857.0832764106.

The spelling of 6404631355 in words is "six billion, four hundred four million, six hundred thirty-one thousand, three hundred fifty-five".