6403811656 has 16 divisors (see below), whose sum is σ = 13098705840. Its totient is φ = 2910823440.

The previous prime is 6403811627. The next prime is 6403811657. The reversal of 6403811656 is 6561183046.

It is not an unprimeable number, because it can be changed into a prime (6403811657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36385206 + ... + 36385381.

It is an arithmetic number, because the mean of its divisors is an integer number (818669115).

Almost surely, 2^6403811656 is an apocalyptic number.

It is an amenable number.

6403811656 is an abundant number, since it is smaller than the sum of its proper divisors (6694894184).

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

6403811656 is a wasteful number, since it uses less digits than its factorization.

6403811656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72770604 (or 72770600 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 6403811656 is about 80023.8193040047. The cubic root of 6403811656 is about 1857.0040465447.

The spelling of 6403811656 in words is "six billion, four hundred three million, eight hundred eleven thousand, six hundred fifty-six".