166668505 has 8 divisors (see below), whose sum is σ = 201200832. Its totient is φ = 132535728.

The previous prime is 166668497. The next prime is 166668553. The reversal of 166668505 is 505866661.

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

It is a cyclic number.

It is not a de Polignac number, because 166668505 - 2³ = 166668497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98967 + ... + 100636.

It is an arithmetic number, because the mean of its divisors is an integer number (25150104).

Almost surely, 2^166668505 is an apocalyptic number.

It is an amenable number.

166668505 is a deficient number, since it is larger than the sum of its proper divisors (34532327).

166668505 is a wasteful number, since it uses less digits than its factorization.

166668505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199775.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 166668505 is about 12910.0156855056. The cubic root of 166668505 is about 550.3232314893.

The spelling of 166668505 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, five hundred five".