1666885375 has 8 divisors (see below), whose sum is σ = 2080273104. Its totient is φ = 1333508200.

The previous prime is 1666885373. The next prime is 1666885391. The reversal of 1666885375 is 5735886661.

It is not a de Polignac number, because 1666885375 - 2¹ = 1666885373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666885373) 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, 6667417 + ... + 6667666.

It is an arithmetic number, because the mean of its divisors is an integer number (260034138).

Almost surely, 2^1666885375 is an apocalyptic number.

1666885375 is a deficient number, since it is larger than the sum of its proper divisors (413387729).

1666885375 is an equidigital number, since it uses as much as digits as its factorization.

1666885375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13335098 (or 13335088 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 55.

The square root of 1666885375 is about 40827.5075776124. The cubic root of 1666885375 is about 1185.6829607088.

The spelling of 1666885375 in words is "one billion, six hundred sixty-six million, eight hundred eighty-five thousand, three hundred seventy-five".