1659549666 has 16 divisors (see below), whose sum is σ = 3368638944. Its totient is φ = 544926624.

The previous prime is 1659549653. The next prime is 1659549677. The reversal of 1659549666 is 6669459561.

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, 2063715 + ... + 2064518.

It is an arithmetic number, because the mean of its divisors is an integer number (210539934).

Almost surely, 2^1659549666 is an apocalyptic number.

1659549666 is an abundant number, since it is smaller than the sum of its proper divisors (1709089278).

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

1659549666 is a wasteful number, since it uses less digits than its factorization.

1659549666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4128305.

The product of its digits is 10497600, while the sum is 57.

The square root of 1659549666 is about 40737.5706934029. The cubic root of 1659549666 is about 1183.9410661445.

The spelling of 1659549666 in words is "one billion, six hundred fifty-nine million, five hundred forty-nine thousand, six hundred sixty-six".