6639565630 has 16 divisors (see below), whose sum is σ = 11977377840. Its totient is φ = 2650012992.

The previous prime is 6639565609. The next prime is 6639565643. The reversal of 6639565630 is 365659366.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721860 + ... + 730999.

It is an arithmetic number, because the mean of its divisors is an integer number (748586115).

Almost surely, 2^6639565630 is an apocalyptic number.

6639565630 is a deficient number, since it is larger than the sum of its proper divisors (5337812210).

6639565630 is a wasteful number, since it uses less digits than its factorization.

6639565630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453323.

The product of its (nonzero) digits is 2624400, while the sum is 49.

The square root of 6639565630 is about 81483.5298081766. The cubic root of 6639565630 is about 1879.5182889481.

The spelling of 6639565630 in words is "six billion, six hundred thirty-nine million, five hundred sixty-five thousand, six hundred thirty".