166435666 has 8 divisors (see below), whose sum is σ = 251863164. Its totient is φ = 82481280.

The previous prime is 166435663. The next prime is 166435679. The reversal of 166435666 is 666534661.

It can be written as a sum of positive squares in 2 ways, for example, as 145082025 + 21353641 = 12045^2 + 4621^2 .

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

It is not an unprimeable number, because it can be changed into a prime (166435663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367995 + ... + 368446.

Almost surely, 2^166435666 is an apocalyptic number.

166435666 is a deficient number, since it is larger than the sum of its proper divisors (85427498).

166435666 is a wasteful number, since it uses less digits than its factorization.

166435666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736556.

The product of its digits is 466560, while the sum is 43.

The square root of 166435666 is about 12900.9947678464. The cubic root of 166435666 is about 550.0668414632.

The spelling of 166435666 in words is "one hundred sixty-six million, four hundred thirty-five thousand, six hundred sixty-six".