166685139 has 12 divisors (see below), whose sum is σ = 240928896. Its totient is φ = 111048912.

The previous prime is 166685137. The next prime is 166685143. The reversal of 166685139 is 931586661.

It is not a de Polignac number, because 166685139 - 2¹ = 166685137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166685094 and 166685103.

It is not an unprimeable number, because it can be changed into a prime (166685137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10254 + ... + 20940.

It is an arithmetic number, because the mean of its divisors is an integer number (20077408).

Almost surely, 2^166685139 is an apocalyptic number.

166685139 is a deficient number, since it is larger than the sum of its proper divisors (74243757).

166685139 is a wasteful number, since it uses less digits than its factorization.

166685139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12426 (or 12423 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 166685139 is about 12910.6598979293. The cubic root of 166685139 is about 550.3415388316.

The spelling of 166685139 in words is "one hundred sixty-six million, six hundred eighty-five thousand, one hundred thirty-nine".