166397087 has 4 divisors (see below), whose sum is σ = 166425480. Its totient is φ = 166368696.

The previous prime is 166397069. The next prime is 166397093. The reversal of 166397087 is 780793661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166397087 - 2¹⁰ = 166396063 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 (166397027) 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, 1793 + ... + 18330.

It is an arithmetic number, because the mean of its divisors is an integer number (41606370).

Almost surely, 2^166397087 is an apocalyptic number.

166397087 is a deficient number, since it is larger than the sum of its proper divisors (28393).

166397087 is an equidigital number, since it uses as much as digits as its factorization.

166397087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28392.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 166397087 is about 12899.4994864142. The cubic root of 166397087 is about 550.0243372151.

The spelling of 166397087 in words is "one hundred sixty-six million, three hundred ninety-seven thousand, eighty-seven".