6661660520 has 32 divisors (see below), whose sum is σ = 14994201600. Its totient is φ = 2663692608.

The previous prime is 6661660517. The next prime is 6661660541. The reversal of 6661660520 is 250661666.

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, 86237 + ... + 144083.

It is an arithmetic number, because the mean of its divisors is an integer number (468568800).

Almost surely, 2^6661660520 is an apocalyptic number.

It is an amenable number.

6661660520 is an abundant number, since it is smaller than the sum of its proper divisors (8332541080).

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

6661660520 is a wasteful number, since it uses less digits than its factorization.

6661660520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60737 (or 60733 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 6661660520 is about 81618.9960732182. The cubic root of 6661660520 is about 1881.6008433560.

The spelling of 6661660520 in words is "six billion, six hundred sixty-one million, six hundred sixty thousand, five hundred twenty".