166211887 has 2 divisors, whose sum is σ = 166211888. Its totient is φ = 166211886.

The previous prime is 166211879. The next prime is 166211939. The reversal of 166211887 is 788112661.

166211887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166211887 - 2³ = 166211879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166211387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83105943 + 83105944.

It is an arithmetic number, because the mean of its divisors is an integer number (83105944).

Almost surely, 2^166211887 is an apocalyptic number.

166211887 is a deficient number, since it is larger than the sum of its proper divisors (1).

166211887 is an equidigital number, since it uses as much as digits as its factorization.

166211887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 166211887 is about 12892.3189147647. The cubic root of 166211887 is about 549.8202023867.

The spelling of 166211887 in words is "one hundred sixty-six million, two hundred eleven thousand, eight hundred eighty-seven".