166223887 has 2 divisors, whose sum is σ = 166223888. Its totient is φ = 166223886.

The previous prime is 166223879. The next prime is 166223899. The reversal of 166223887 is 788322661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166223887 - 2³ = 166223879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166223857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83111943 + 83111944.

It is an arithmetic number, because the mean of its divisors is an integer number (83111944).

Almost surely, 2^166223887 is an apocalyptic number.

166223887 is a deficient number, since it is larger than the sum of its proper divisors (1).

166223887 is an equidigital number, since it uses as much as digits as its factorization.

166223887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 166223887 is about 12892.7842997546. The cubic root of 166223887 is about 549.8334338585.

The spelling of 166223887 in words is "one hundred sixty-six million, two hundred twenty-three thousand, eight hundred eighty-seven".