6643608902 has 16 divisors (see below), whose sum is σ = 11431076352. Its totient is φ = 2836752840.

The previous prime is 6643608877. The next prime is 6643608911. The reversal of 6643608902 is 2098063466.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871748 + ... + 879335.

It is an arithmetic number, because the mean of its divisors is an integer number (714442272).

Almost surely, 2^6643608902 is an apocalyptic number.

6643608902 is a deficient number, since it is larger than the sum of its proper divisors (4787467450).

6643608902 is a wasteful number, since it uses less digits than its factorization.

6643608902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751363.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 6643608902 is about 81508.3363957332. The cubic root of 6643608902 is about 1879.8997326561.

The spelling of 6643608902 in words is "six billion, six hundred forty-three million, six hundred eight thousand, nine hundred two".