166108287 has 4 divisors (see below), whose sum is σ = 221477720. Its totient is φ = 110738856.

The previous prime is 166108211. The next prime is 166108291. The reversal of 166108287 is 782801661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782801661 = 3 ⋅260933887.

It is not a de Polignac number, because 166108287 - 2²⁰ = 165059711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166108297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27684712 + ... + 27684717.

It is an arithmetic number, because the mean of its divisors is an integer number (55369430).

Almost surely, 2^166108287 is an apocalyptic number.

166108287 is a deficient number, since it is larger than the sum of its proper divisors (55369433).

166108287 is an equidigital number, since it uses as much as digits as its factorization.

166108287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55369432.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 166108287 is about 12888.3003922162. The cubic root of 166108287 is about 549.7059441894.

The spelling of 166108287 in words is "one hundred sixty-six million, one hundred eight thousand, two hundred eighty-seven".