166161253 has 4 divisors (see below), whose sum is σ = 168264640. Its totient is φ = 164057868.

The previous prime is 166161241. The next prime is 166161257. The reversal of 166161253 is 352161661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166161253 - 2⁵ = 166161221 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 (166161257) 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 3 ways as a sum of consecutive naturals, for example, 1051575 + ... + 1051732.

It is an arithmetic number, because the mean of its divisors is an integer number (42066160).

Almost surely, 2^166161253 is an apocalyptic number.

It is an amenable number.

166161253 is a deficient number, since it is larger than the sum of its proper divisors (2103387).

166161253 is an equidigital number, since it uses as much as digits as its factorization.

166161253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103386.

The product of its digits is 6480, while the sum is 31.

The square root of 166161253 is about 12890.3550377792. The cubic root of 166161253 is about 549.7643651778.

The spelling of 166161253 in words is "one hundred sixty-six million, one hundred sixty-one thousand, two hundred fifty-three".