1659907666 has 16 divisors (see below), whose sum is σ = 2520917568. Its totient is φ = 819666000.

The previous prime is 1659907657. The next prime is 1659907703. The reversal of 1659907666 is 6667099561.

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, 36361 + ... + 68131.

It is an arithmetic number, because the mean of its divisors is an integer number (157557348).

Almost surely, 2^1659907666 is an apocalyptic number.

1659907666 is a deficient number, since it is larger than the sum of its proper divisors (861009902).

1659907666 is a wasteful number, since it uses less digits than its factorization.

1659907666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32097.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 1659907666 is about 40741.9644347201. The cubic root of 1659907666 is about 1184.0261937419.

The spelling of 1659907666 in words is "one billion, six hundred fifty-nine million, nine hundred seven thousand, six hundred sixty-six".