166213887 has 8 divisors (see below), whose sum is σ = 253278336. Its totient is φ = 94979352.

The previous prime is 166213849. The next prime is 166213951. The reversal of 166213887 is 788312661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166213887 - 2⁶ = 166213823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166213687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3957453 + ... + 3957494.

It is an arithmetic number, because the mean of its divisors is an integer number (31659792).

Almost surely, 2^166213887 is an apocalyptic number.

166213887 is a deficient number, since it is larger than the sum of its proper divisors (87064449).

166213887 is an equidigital number, since it uses as much as digits as its factorization.

166213887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914957.

The product of its digits is 96768, while the sum is 42.

The square root of 166213887 is about 12892.3964800963. The cubic root of 166213887 is about 549.8224076762.

The spelling of 166213887 in words is "one hundred sixty-six million, two hundred thirteen thousand, eight hundred eighty-seven".