166980887 has 2 divisors, whose sum is σ = 166980888. Its totient is φ = 166980886.

The previous prime is 166980881. The next prime is 166980907. The reversal of 166980887 is 788089661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166980887 - 2⁴ = 166980871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166980881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83490443 + 83490444.

It is an arithmetic number, because the mean of its divisors is an integer number (83490444).

Almost surely, 2^166980887 is an apocalyptic number.

166980887 is a deficient number, since it is larger than the sum of its proper divisors (1).

166980887 is an equidigital number, since it uses as much as digits as its factorization.

166980887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 166980887 is about 12922.1084579878. The cubic root of 166980887 is about 550.6668352608. Note that the first 3 decimals are identical.

The spelling of 166980887 in words is "one hundred sixty-six million, nine hundred eighty thousand, eight hundred eighty-seven".