6520086666 has 48 divisors (see below), whose sum is σ = 14275572480. Its totient is φ = 2150547840.

The previous prime is 6520086649. The next prime is 6520086707. The reversal of 6520086666 is 6666800256.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1403175 + ... + 1407813.

It is an arithmetic number, because the mean of its divisors is an integer number (297407760).

Almost surely, 2^6520086666 is an apocalyptic number.

6520086666 is an abundant number, since it is smaller than the sum of its proper divisors (7755485814).

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

6520086666 is a wasteful number, since it uses less digits than its factorization.

6520086666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451 (or 5448 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6520086666 is about 80747.0536056889. The cubic root of 6520086666 is about 1868.1760042533.

The spelling of 6520086666 in words is "six billion, five hundred twenty million, eighty-six thousand, six hundred sixty-six".