166447901 has 8 divisors (see below), whose sum is σ = 176398200. Its totient is φ = 156515328.

The previous prime is 166447877. The next prime is 166447903. The reversal of 166447901 is 109744661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 130759225 + 35688676 = 11435^2 + 5974^2 .

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

It is not a de Polignac number, because 166447901 - 2¹⁰ = 166446877 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 (166447903) 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 7 ways as a sum of consecutive naturals, for example, 18275 + ... + 25823.

It is an arithmetic number, because the mean of its divisors is an integer number (22049775).

Almost surely, 2^166447901 is an apocalyptic number.

It is an amenable number.

166447901 is a deficient number, since it is larger than the sum of its proper divisors (9950299).

166447901 is a wasteful number, since it uses less digits than its factorization.

166447901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8863.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 166447901 is about 12901.4689473718. The cubic root of 166447901 is about 550.0803199502.

The spelling of 166447901 in words is "one hundred sixty-six million, four hundred forty-seven thousand, nine hundred one".