6403322556 has 18 divisors (see below), whose sum is σ = 16186176552. Its totient is φ = 2134440840.

The previous prime is 6403322551. The next prime is 6403322557. The reversal of 6403322556 is 6552233046.

6403322556 is a `hidden beast` number, since 640 + 3 + 3 + 2 + 2 + 5 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 177870071 = 6403322556 / (6 + 4 + 0 + 3 + 3 + 2 + 2 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 6403322556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403322551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88935000 + ... + 88935071.

Almost surely, 2^6403322556 is an apocalyptic number.

It is an amenable number.

6403322556 is an abundant number, since it is smaller than the sum of its proper divisors (9782853996).

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

6403322556 is a wasteful number, since it uses less digits than its factorization.

6403322556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177870081 (or 177870076 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 6403322556 is about 80020.7632805386. The cubic root of 6403322556 is about 1856.9567682542.

The spelling of 6403322556 in words is "six billion, four hundred three million, three hundred twenty-two thousand, five hundred fifty-six".