166656242 has 16 divisors (see below), whose sum is σ = 253032120. Its totient is φ = 82317312.

The previous prime is 166656227. The next prime is 166656247. The reversal of 166656242 is 242656661.

It can be written as a sum of positive squares in 4 ways, for example, as 121242121 + 45414121 = 11011^2 + 6739^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166656196 and 166656205.

It is not an unprimeable number, because it can be changed into a prime (166656247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78734 + ... + 80822.

Almost surely, 2^166656242 is an apocalyptic number.

166656242 is a deficient number, since it is larger than the sum of its proper divisors (86375878).

166656242 is a wasteful number, since it uses less digits than its factorization.

166656242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557.

The product of its digits is 103680, while the sum is 38.

The square root of 166656242 is about 12909.5407354406. The cubic root of 166656242 is about 550.3097340796.

The spelling of 166656242 in words is "one hundred sixty-six million, six hundred fifty-six thousand, two hundred forty-two".