166222994 has 12 divisors (see below), whose sum is σ = 290042334. Its totient is φ = 71238384.

The previous prime is 166222967. The next prime is 166223017. The reversal of 166222994 is 499222661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 166074769 + 148225 = 12887^2 + 385^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 847979 + ... + 848174.

Almost surely, 2^166222994 is an apocalyptic number.

166222994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

166222994 is a deficient number, since it is larger than the sum of its proper divisors (123819340).

166222994 is a wasteful number, since it uses less digits than its factorization.

166222994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696169 (or 1696162 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 166222994 is about 12892.7496679335. The cubic root of 166222994 is about 549.8324492384.

The spelling of 166222994 in words is "one hundred sixty-six million, two hundred twenty-two thousand, nine hundred ninety-four".