166664986 has 8 divisors (see below), whose sum is σ = 253422324. Its totient is φ = 82190880.

The previous prime is 166664963. The next prime is 166665011. The reversal of 166664986 is 689466661.

It can be written as a sum of positive squares in 2 ways, for example, as 155475961 + 11189025 = 12469^2 + 3345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570625 + ... + 570916.

Almost surely, 2^166664986 is an apocalyptic number.

166664986 is a deficient number, since it is larger than the sum of its proper divisors (86757338).

166664986 is a wasteful number, since it uses less digits than its factorization.

166664986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141616.

The product of its digits is 2239488, while the sum is 52.

The square root of 166664986 is about 12909.8793952539. The cubic root of 166664986 is about 550.3193583299.

The spelling of 166664986 in words is "one hundred sixty-six million, six hundred sixty-four thousand, nine hundred eighty-six".