166129685 has 8 divisors (see below), whose sum is σ = 199433016. Its totient is φ = 132852160.

The previous prime is 166129681. The next prime is 166129703. The reversal of 166129685 is 586921661.

166129685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3364 + 166126321 = 58^2 + 12889^2 .

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

It is not a de Polignac number, because 166129685 - 2² = 166129681 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 (166129681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13115 + ... + 22455.

It is an arithmetic number, because the mean of its divisors is an integer number (24929127).

Almost surely, 2^166129685 is an apocalyptic number.

It is an amenable number.

166129685 is a deficient number, since it is larger than the sum of its proper divisors (33303331).

166129685 is an equidigital number, since it uses as much as digits as its factorization.

166129685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12903.

The product of its digits is 155520, while the sum is 44.

The square root of 166129685 is about 12889.1304982144. The cubic root of 166129685 is about 549.7295474724.

The spelling of 166129685 in words is "one hundred sixty-six million, one hundred twenty-nine thousand, six hundred eighty-five".