166685016685 has 16 divisors (see below), whose sum is σ = 229690359360. Its totient is φ = 114845178240.

The previous prime is 166685016653. The next prime is 166685016703. The reversal of 166685016685 is 586610586661.

It is not a de Polignac number, because 166685016685 - 2⁵ = 166685016653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79752552 + ... + 79754641.

It is an arithmetic number, because the mean of its divisors is an integer number (14355647460).

Almost surely, 2^166685016685 is an apocalyptic number.

It is an amenable number.

166685016685 is a deficient number, since it is larger than the sum of its proper divisors (63005342675).

166685016685 is a wasteful number, since it uses less digits than its factorization.

166685016685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159507228.

The product of its (nonzero) digits is 12441600, while the sum is 58.

The spelling of 166685016685 in words is "one hundred sixty-six billion, six hundred eighty-five million, sixteen thousand, six hundred eighty-five".