166074391 has 8 divisors (see below), whose sum is σ = 192911264. Its totient is φ = 140015520.

The previous prime is 166074373. The next prime is 166074397. The reversal of 166074391 is 193470661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166074391 - 2⁷ = 166074263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166074391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166074397) 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 7 ways as a sum of consecutive naturals, for example, 194040 + ... + 194893.

It is an arithmetic number, because the mean of its divisors is an integer number (24113908).

Almost surely, 2^166074391 is an apocalyptic number.

166074391 is a deficient number, since it is larger than the sum of its proper divisors (26836873).

166074391 is an equidigital number, since it uses as much as digits as its factorization.

166074391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389001.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 166074391 is about 12886.9853340492. The cubic root of 166074391 is about 549.6685507104.

The spelling of 166074391 in words is "one hundred sixty-six million, seventy-four thousand, three hundred ninety-one".