166461851 has 4 divisors (see below), whose sum is σ = 166993992. Its totient is φ = 165929712.

The previous prime is 166461829. The next prime is 166461877. The reversal of 166461851 is 158164661.

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 166461851 - 2¹⁴ = 166445467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166461151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265601 + ... + 266226.

It is an arithmetic number, because the mean of its divisors is an integer number (41748498).

Almost surely, 2^166461851 is an apocalyptic number.

166461851 is a deficient number, since it is larger than the sum of its proper divisors (532141).

166461851 is an equidigital number, since it uses as much as digits as its factorization.

166461851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532140.

The product of its digits is 34560, while the sum is 38.

The square root of 166461851 is about 12902.0095721558. The cubic root of 166461851 is about 550.0956869330.

The spelling of 166461851 in words is "one hundred sixty-six million, four hundred sixty-one thousand, eight hundred fifty-one".