6645025332 has 72 divisors (see below), whose sum is σ = 18634805280. Its totient is φ = 1979507520.

The previous prime is 6645025291. The next prime is 6645025333. The reversal of 6645025332 is 2335205466.

6645025332 is a `hidden beast` number, since 6 + 645 + 0 + 2 + 5 + 3 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645025333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118843 + ... + 165570.

It is an arithmetic number, because the mean of its divisors is an integer number (258816740).

Almost surely, 2^6645025332 is an apocalyptic number.

It is an amenable number.

6645025332 is an abundant number, since it is smaller than the sum of its proper divisors (11989779948).

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

6645025332 is a wasteful number, since it uses less digits than its factorization.

6645025332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284493 (or 284488 counting only the distinct ones).

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

The square root of 6645025332 is about 81517.0247985045. The cubic root of 6645025332 is about 1880.0333225571.

The spelling of 6645025332 in words is "six billion, six hundred forty-five million, twenty-five thousand, three hundred thirty-two".