166660663 has 16 divisors (see below), whose sum is σ = 183859200. Its totient is φ = 150127200.

The previous prime is 166660657. The next prime is 166660667. The reversal of 166660663 is 366066661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166660663 - 2⁵ = 166660631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166660667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115098 + ... + 116536.

It is an arithmetic number, because the mean of its divisors is an integer number (11491200).

Almost surely, 2^166660663 is an apocalyptic number.

166660663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166660663 is a deficient number, since it is larger than the sum of its proper divisors (17198537).

166660663 is a wasteful number, since it uses less digits than its factorization.

166660663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 166660663 is about 12909.7119642539. The cubic root of 166660663 is about 550.3146001796.

The spelling of 166660663 in words is "one hundred sixty-six million, six hundred sixty thousand, six hundred sixty-three".