166299139 has 4 divisors (see below), whose sum is σ = 166337680. Its totient is φ = 166260600.

The previous prime is 166299121. The next prime is 166299143. The reversal of 166299139 is 931992661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931992661 = 2531 ⋅368231.

It is a cyclic number.

It is not a de Polignac number, because 166299139 - 2²⁷ = 32081411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166299179) 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, 11844 + ... + 21745.

It is an arithmetic number, because the mean of its divisors is an integer number (41584420).

Almost surely, 2^166299139 is an apocalyptic number.

166299139 is a deficient number, since it is larger than the sum of its proper divisors (38541).

166299139 is an equidigital number, since it uses as much as digits as its factorization.

166299139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38540.

The product of its digits is 157464, while the sum is 46.

The square root of 166299139 is about 12895.7023461307. The cubic root of 166299139 is about 549.9163939032.

The spelling of 166299139 in words is "one hundred sixty-six million, two hundred ninety-nine thousand, one hundred thirty-nine".