166718887 has 2 divisors, whose sum is σ = 166718888. Its totient is φ = 166718886.

The previous prime is 166718873. The next prime is 166718891. The reversal of 166718887 is 788817661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166718887 - 2⁷ = 166718759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166718087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83359443 + 83359444.

It is an arithmetic number, because the mean of its divisors is an integer number (83359444).

Almost surely, 2^166718887 is an apocalyptic number.

166718887 is a deficient number, since it is larger than the sum of its proper divisors (1).

166718887 is an equidigital number, since it uses as much as digits as its factorization.

166718887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 52.

The square root of 166718887 is about 12911.9668137740. The cubic root of 166718887 is about 550.3786780612.

The spelling of 166718887 in words is "one hundred sixty-six million, seven hundred eighteen thousand, eight hundred eighty-seven".