1660889960 has 64 divisors (see below), whose sum is σ = 3774373200. Its totient is φ = 657750016.

The previous prime is 1660889957. The next prime is 1660889977. The reversal of 1660889960 is 699880661.

It can be written as a sum of positive squares in 8 ways, for example, as 393387556 + 1267502404 = 19834^2 + 35602^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2691572 + ... + 2692188.

Almost surely, 2^1660889960 is an apocalyptic number.

1660889960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660889960 is an abundant number, since it is smaller than the sum of its proper divisors (2113483240).

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

1660889960 is a wasteful number, since it uses less digits than its factorization.

1660889960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 1660889960 is about 40754.0177160486. The cubic root of 1660889960 is about 1184.2597072281.

The spelling of 1660889960 in words is "one billion, six hundred sixty million, eight hundred eighty-nine thousand, nine hundred sixty".