6659805615 has 36 divisors (see below), whose sum is σ = 11256181704. Its totient is φ = 3361920192.

The previous prime is 6659805587. The next prime is 6659805619. The reversal of 6659805615 is 5165089566.

It is a happy number.

It is not a de Polignac number, because 6659805615 - 2⁵ = 6659805583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659805619) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6004681 + ... + 6005789.

It is an arithmetic number, because the mean of its divisors is an integer number (312671714).

Almost surely, 2^6659805615 is an apocalyptic number.

6659805615 is a deficient number, since it is larger than the sum of its proper divisors (4596376089).

6659805615 is an equidigital number, since it uses as much as digits as its factorization.

6659805615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 51.

The square root of 6659805615 is about 81607.6320879365. The cubic root of 6659805615 is about 1881.4261864621.

The spelling of 6659805615 in words is "six billion, six hundred fifty-nine million, eight hundred five thousand, six hundred fifteen".