6432644655 has 24 divisors (see below), whose sum is σ = 11736756720. Its totient is φ = 3250177920.

The previous prime is 6432644633. The next prime is 6432644719. The reversal of 6432644655 is 5564462346.

It is a happy number.

It is not a de Polignac number, because 6432644655 - 2¹¹ = 6432642607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6432644655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3760926 + ... + 3762635.

It is an arithmetic number, because the mean of its divisors is an integer number (489031530).

Almost surely, 2^6432644655 is an apocalyptic number.

6432644655 is a deficient number, since it is larger than the sum of its proper divisors (5304112065).

6432644655 is a wasteful number, since it uses less digits than its factorization.

6432644655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7523591 (or 7523588 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

The square root of 6432644655 is about 80203.7695809867. The cubic root of 6432644655 is about 1859.7869119398.

The spelling of 6432644655 in words is "six billion, four hundred thirty-two million, six hundred forty-four thousand, six hundred fifty-five".