166668501 has 8 divisors (see below), whose sum is σ = 223353504. Its totient is φ = 110547920.

The previous prime is 166668497. The next prime is 166668553. The reversal of 166668501 is 105866661.

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 166668501 - 2² = 166668497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166668501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166668571) 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, 140415 + ... + 141596.

It is an arithmetic number, because the mean of its divisors is an integer number (27919188).

Almost surely, 2^166668501 is an apocalyptic number.

It is an amenable number.

166668501 is a deficient number, since it is larger than the sum of its proper divisors (56685003).

166668501 is a wasteful number, since it uses less digits than its factorization.

166668501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282211.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 166668501 is about 12910.0155305871. The cubic root of 166668501 is about 550.3232270868.

Subtracting from 166668501 its product of nonzero digits (51840), we obtain a palindrome (166616661).

The spelling of 166668501 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, five hundred one".