6639136506 has 12 divisors (see below), whose sum is σ = 14384795802. Its totient is φ = 2213045496.

The previous prime is 6639136459. The next prime is 6639136523. The reversal of 6639136506 is 6056319366.

6639136506 is a `hidden beast` number, since 6 + 6 + 3 + 9 + 136 + 506 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4837898025 + 1801238481 = 69555^2 + 42441^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184420441 + ... + 184420476.

Almost surely, 2^6639136506 is an apocalyptic number.

6639136506 is an abundant number, since it is smaller than the sum of its proper divisors (7745659296).

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

6639136506 is a wasteful number, since it uses less digits than its factorization.

6639136506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368840925 (or 368840922 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 45.

The square root of 6639136506 is about 81480.8965709141. The cubic root of 6639136506 is about 1879.4777961495.

The spelling of 6639136506 in words is "six billion, six hundred thirty-nine million, one hundred thirty-six thousand, five hundred six".