166158247 has 4 divisors (see below), whose sum is σ = 168498576. Its totient is φ = 163817920.

The previous prime is 166158229. The next prime is 166158253. The reversal of 166158247 is 742851661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742851661 = 787 ⋅943903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166158247 is a prime.

It is a super-2 number, since 2×166158247² = 55217126092226018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166158277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170058 + ... + 1170199.

It is an arithmetic number, because the mean of its divisors is an integer number (42124644).

Almost surely, 2^166158247 is an apocalyptic number.

166158247 is a deficient number, since it is larger than the sum of its proper divisors (2340329).

166158247 is an equidigital number, since it uses as much as digits as its factorization.

166158247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340328.

The product of its digits is 80640, while the sum is 40.

The square root of 166158247 is about 12890.2384384464. The cubic root of 166158247 is about 549.7610499211.

The spelling of 166158247 in words is "one hundred sixty-six million, one hundred fifty-eight thousand, two hundred forty-seven".