6638717660 has 12 divisors (see below), whose sum is σ = 13941307128. Its totient is φ = 2655487056.

The previous prime is 6638717653. The next prime is 6638717681. The reversal of 6638717660 is 667178366.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6638717599 and 6638717608.

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, 165967922 + ... + 165967961.

It is an arithmetic number, because the mean of its divisors is an integer number (1161775594).

Almost surely, 2^6638717660 is an apocalyptic number.

It is an amenable number.

6638717660 is an abundant number, since it is smaller than the sum of its proper divisors (7302589468).

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

6638717660 is a wasteful number, since it uses less digits than its factorization.

6638717660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331935892 (or 331935890 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 6638717660 is about 81478.3263205621. The cubic root of 6638717660 is about 1879.4382715159.

The spelling of 6638717660 in words is "six billion, six hundred thirty-eight million, seven hundred seventeen thousand, six hundred sixty".