166640570 has 8 divisors (see below), whose sum is σ = 299953044. Its totient is φ = 66656224.

The previous prime is 166640569. The next prime is 166640581. The reversal of 166640570 is 75046661.

It can be written as a sum of positive squares in 2 ways, for example, as 162996289 + 3644281 = 12767^2 + 1909^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 166640570.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8332019 + ... + 8332038.

Almost surely, 2^166640570 is an apocalyptic number.

166640570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166640570 is a deficient number, since it is larger than the sum of its proper divisors (133312474).

166640570 is a wasteful number, since it uses less digits than its factorization.

166640570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16664064.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 166640570 is about 12908.9337282364. The cubic root of 166640570 is about 550.2924835516.

The spelling of 166640570 in words is "one hundred sixty-six million, six hundred forty thousand, five hundred seventy".