166690222 has 8 divisors (see below), whose sum is σ = 254273400. Its totient is φ = 81932424.

The previous prime is 166690213. The next prime is 166690241. The reversal of 166690222 is 222096661.

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

It is a super-2 number, since 2×166690222² = 55571260220818568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706197 + ... + 706432.

It is an arithmetic number, because the mean of its divisors is an integer number (31784175).

Almost surely, 2^166690222 is an apocalyptic number.

166690222 is a deficient number, since it is larger than the sum of its proper divisors (87583178).

166690222 is a wasteful number, since it uses less digits than its factorization.

166690222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412690.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 166690222 is about 12910.8567492634. The cubic root of 166690222 is about 550.3471329268.

The spelling of 166690222 in words is "one hundred sixty-six million, six hundred ninety thousand, two hundred twenty-two".