6621645332 has 12 divisors (see below), whose sum is σ = 11610124596. Its totient is φ = 3304466880.

The previous prime is 6621645323. The next prime is 6621645347. The reversal of 6621645332 is 2335461266.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4946871556 + 1674773776 = 70334^2 + 40924^2 .

It is a congruent number.

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, 1586603 + ... + 1590770.

It is an arithmetic number, because the mean of its divisors is an integer number (967510383).

Almost surely, 2^6621645332 is an apocalyptic number.

It is an amenable number.

6621645332 is a deficient number, since it is larger than the sum of its proper divisors (4988479264).

6621645332 is a wasteful number, since it uses less digits than its factorization.

6621645332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177898 (or 3177896 counting only the distinct ones).

The product of its digits is 155520, while the sum is 38.

The square root of 6621645332 is about 81373.4928093909. The cubic root of 6621645332 is about 1877.8258149940.

The spelling of 6621645332 in words is "six billion, six hundred twenty-one million, six hundred forty-five thousand, three hundred thirty-two".