6659638520 has 16 divisors (see below), whose sum is σ = 14984186760. Its totient is φ = 2663855392.

The previous prime is 6659638501. The next prime is 6659638537. The reversal of 6659638520 is 258369566.

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, 83245442 + ... + 83245521.

Almost surely, 2^6659638520 is an apocalyptic number.

It is an amenable number.

6659638520 is an abundant number, since it is smaller than the sum of its proper divisors (8324548240).

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

6659638520 is a wasteful number, since it uses less digits than its factorization.

6659638520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166490974 (or 166490970 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The square root of 6659638520 is about 81606.6083108470. The cubic root of 6659638520 is about 1881.4104512912.

The spelling of 6659638520 in words is "six billion, six hundred fifty-nine million, six hundred thirty-eight thousand, five hundred twenty".