1666604648 has 8 divisors (see below), whose sum is σ = 3124883730. Its totient is φ = 833302320.

The previous prime is 1666604593. The next prime is 1666604677. The reversal of 1666604648 is 8464066661.

It can be written as a sum of positive squares in only one way, i.e., 1164037924 + 502566724 = 34118^2 + 22418^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104162783 + ... + 104162798.

Almost surely, 2^1666604648 is an apocalyptic number.

It is an amenable number.

1666604648 is a deficient number, since it is larger than the sum of its proper divisors (1458279082).

1666604648 is a wasteful number, since it uses less digits than its factorization.

1666604648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208325587 (or 208325583 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 1666604648 is about 40824.0694688807. The cubic root of 1666604648 is about 1185.6163950623.

The spelling of 1666604648 in words is "one billion, six hundred sixty-six million, six hundred four thousand, six hundred forty-eight".