1666885524 has 12 divisors (see below), whose sum is σ = 3889399584. Its totient is φ = 555628504.

The previous prime is 1666885511. The next prime is 1666885607. The reversal of 1666885524 is 4255886661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69453552 + ... + 69453575.

It is an arithmetic number, because the mean of its divisors is an integer number (324116632).

Almost surely, 2^1666885524 is an apocalyptic number.

It is an amenable number.

1666885524 is an abundant number, since it is smaller than the sum of its proper divisors (2222514060).

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

1666885524 is a wasteful number, since it uses less digits than its factorization.

1666885524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138907134 (or 138907132 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 51.

The square root of 1666885524 is about 40827.5094023625. The cubic root of 1666885524 is about 1185.6829960375.

The spelling of 1666885524 in words is "one billion, six hundred sixty-six million, eight hundred eighty-five thousand, five hundred twenty-four".