1660871604 has 24 divisors (see below), whose sum is σ = 4428991168. Its totient is φ = 474534720.

The previous prime is 1660871591. The next prime is 1660871621. The reversal of 1660871604 is 4061780661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9886057 + ... + 9886224.

Almost surely, 2^1660871604 is an apocalyptic number.

1660871604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1660871604 is an abundant number, since it is smaller than the sum of its proper divisors (2768119564).

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

1660871604 is a wasteful number, since it uses less digits than its factorization.

1660871604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19772295 (or 19772293 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1660871604 is about 40753.7925106364. The cubic root of 1660871604 is about 1184.2553444363.

The spelling of 1660871604 in words is "one billion, six hundred sixty million, eight hundred seventy-one thousand, six hundred four".