166342251 has 4 divisors (see below), whose sum is σ = 221789672. Its totient is φ = 110894832.

The previous prime is 166342243. The next prime is 166342301. The reversal of 166342251 is 152243661.

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

It is not a de Polignac number, because 166342251 - 2³ = 166342243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166342201) 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, 27723706 + ... + 27723711.

It is an arithmetic number, because the mean of its divisors is an integer number (55447418).

Almost surely, 2^166342251 is an apocalyptic number.

166342251 is a deficient number, since it is larger than the sum of its proper divisors (55447421).

166342251 is an equidigital number, since it uses as much as digits as its factorization.

166342251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55447420.

The product of its digits is 8640, while the sum is 30.

The square root of 166342251 is about 12897.3738024452. The cubic root of 166342251 is about 549.9639105796.

The spelling of 166342251 in words is "one hundred sixty-six million, three hundred forty-two thousand, two hundred fifty-one".