166873666 has 8 divisors (see below), whose sum is σ = 265034700. Its totient is φ = 78528768.

The previous prime is 166873661. The next prime is 166873667. The reversal of 166873666 is 666378661.

It can be written as a sum of positive squares in 2 ways, for example, as 164994025 + 1879641 = 12845^2 + 1371^2 .

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 (166873661) 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, 2453991 + ... + 2454058.

Almost surely, 2^166873666 is an apocalyptic number.

166873666 is a deficient number, since it is larger than the sum of its proper divisors (98161034).

166873666 is a wasteful number, since it uses less digits than its factorization.

166873666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908068.

The product of its digits is 1306368, while the sum is 49.

The square root of 166873666 is about 12917.9590493235. The cubic root of 166873666 is about 550.5489461383.

The spelling of 166873666 in words is "one hundred sixty-six million, eight hundred seventy-three thousand, six hundred sixty-six".