166356666 has 120 divisors (see below), whose sum is σ = 456857280. Its totient is φ = 44988048.

The previous prime is 166356661. The next prime is 166356691. The reversal of 166356666 is 666653661.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166356661) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 150271 + ... + 151373.

It is an arithmetic number, because the mean of its divisors is an integer number (3807144).

Almost surely, 2^166356666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166356666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228428640).

166356666 is an abundant number, since it is smaller than the sum of its proper divisors (290500614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166356666 is a wasteful number, since it uses less digits than its factorization.

166356666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1134 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 166356666 is about 12897.9326250372. The cubic root of 166356666 is about 549.9797965030.

The spelling of 166356666 in words is "one hundred sixty-six million, three hundred fifty-six thousand, six hundred sixty-six".