1666445232 has 40 divisors (see below), whose sum is σ = 4338896896. Its totient is φ = 551105856.

The previous prime is 1666445219. The next prime is 1666445237. The reversal of 1666445232 is 2325446661.

It is a super-2 number, since 2×1666445232² = 5554079422511067648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666445237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130588 + ... + 142779.

Almost surely, 2^1666445232 is an apocalyptic number.

1666445232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666445232 is an abundant number, since it is smaller than the sum of its proper divisors (2672451664).

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

1666445232 is a wasteful number, since it uses less digits than its factorization.

1666445232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273505 (or 273499 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The square root of 1666445232 is about 40822.1169465769. The cubic root of 1666445232 is about 1185.5785912055.

The spelling of 1666445232 in words is "one billion, six hundred sixty-six million, four hundred forty-five thousand, two hundred thirty-two".