1666888423875 has 48 divisors (see below), whose sum is σ = 3006227621280. Its totient is φ = 888597864000.

The previous prime is 1666888423861. The next prime is 1666888423919. The reversal of 1666888423875 is 5783248886661.

It is not a de Polignac number, because 1666888423875 - 2⁷ = 1666888423747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2111385 + ... + 2791365.

It is an arithmetic number, because the mean of its divisors is an integer number (62629742110).

Almost surely, 2^{1666888423875} is an apocalyptic number.

1666888423875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666888423875 is a deficient number, since it is larger than the sum of its proper divisors (1339339197405).

1666888423875 is a wasteful number, since it uses less digits than its factorization.

1666888423875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682181 (or 682168 counting only the distinct ones).

The product of its digits is 743178240, while the sum is 72.

The spelling of 1666888423875 in words is "one trillion, six hundred sixty-six billion, eight hundred eighty-eight million, four hundred twenty-three thousand, eight hundred seventy-five".