6403912656 has 80 divisors (see below), whose sum is σ = 16700490624. Its totient is φ = 2114445312.

The previous prime is 6403912621. The next prime is 6403912661. The reversal of 6403912656 is 6562193046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4424925 + ... + 4426371.

Almost surely, 2^6403912656 is an apocalyptic number.

It is an amenable number.

6403912656 is an abundant number, since it is smaller than the sum of its proper divisors (10296577968).

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

6403912656 is a wasteful number, since it uses less digits than its factorization.

6403912656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268 (or 2262 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 6403912656 is about 80024.4503636232. The cubic root of 6403912656 is about 1857.0138092939.

The spelling of 6403912656 in words is "six billion, four hundred three million, nine hundred twelve thousand, six hundred fifty-six".