166634261 has 8 divisors (see below), whose sum is σ = 172543800. Its totient is φ = 160735680.

The previous prime is 166634257. The next prime is 166634309. The reversal of 166634261 is 162436661.

It can be written as a sum of positive squares in 4 ways, for example, as 2640625 + 163993636 = 1625^2 + 12806^2 .

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 166634261 - 2² = 166634257 is a prime.

It is a super-2 number, since 2×166634261² = 55533953878032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166634201) 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, 39431 + ... + 43451.

It is an arithmetic number, because the mean of its divisors is an integer number (21567975).

Almost surely, 2^166634261 is an apocalyptic number.

It is an amenable number.

166634261 is a deficient number, since it is larger than the sum of its proper divisors (5909539).

166634261 is a wasteful number, since it uses less digits than its factorization.

166634261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5479.

The product of its digits is 31104, while the sum is 35.

The square root of 166634261 is about 12908.6893602720. The cubic root of 166634261 is about 550.2855387860.

The spelling of 166634261 in words is "one hundred sixty-six million, six hundred thirty-four thousand, two hundred sixty-one".