6404774755 has 4 divisors (see below), whose sum is σ = 7685729712. Its totient is φ = 5123819800.

The previous prime is 6404774731. The next prime is 6404774767. The reversal of 6404774755 is 5574774046.

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

It is not a de Polignac number, because 6404774755 - 2⁷ = 6404774627 is a prime.

It is a super-2 number, since 2×6404774755² = 82042279324570620050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6404774699 and 6404774708.

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, 640477471 + ... + 640477480.

It is an arithmetic number, because the mean of its divisors is an integer number (1921432428).

Almost surely, 2^6404774755 is an apocalyptic number.

6404774755 is a deficient number, since it is larger than the sum of its proper divisors (1280954957).

6404774755 is a wasteful number, since it uses less digits than its factorization.

6404774755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280954956.

The product of its (nonzero) digits is 3292800, while the sum is 49.

The square root of 6404774755 is about 80029.8366548377. The cubic root of 6404774755 is about 1857.0971363681.

The spelling of 6404774755 in words is "six billion, four hundred four million, seven hundred seventy-four thousand, seven hundred fifty-five".