1666592172 has 72 divisors (see below), whose sum is σ = 4992938496. Its totient is φ = 476167248.

The previous prime is 1666592111. The next prime is 1666592177. The reversal of 1666592172 is 2712956661.

It is not an unprimeable number, because it can be changed into a prime (1666592177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115668 + ... + 129275.

It is an arithmetic number, because the mean of its divisors is an integer number (69346368).

Almost surely, 2^1666592172 is an apocalyptic number.

1666592172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666592172 is an abundant number, since it is smaller than the sum of its proper divisors (3326346324).

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

1666592172 is a wasteful number, since it uses less digits than its factorization.

1666592172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244969 (or 244955 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1666592172 is about 40823.9166665816. The cubic root of 1666592172 is about 1185.6134365948.

The spelling of 1666592172 in words is "one billion, six hundred sixty-six million, five hundred ninety-two thousand, one hundred seventy-two".