166447906 has 4 divisors (see below), whose sum is σ = 249671862. Its totient is φ = 83223952.

The previous prime is 166447903. The next prime is 166447933. The reversal of 166447906 is 609744661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 113230881 + 53217025 = 10641^2 + 7295^2 .

It is not an unprimeable number, because it can be changed into a prime (166447903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41611975 + ... + 41611978.

Almost surely, 2^166447906 is an apocalyptic number.

166447906 is a deficient number, since it is larger than the sum of its proper divisors (83223956).

166447906 is an equidigital number, since it uses as much as digits as its factorization.

166447906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83223955.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 166447906 is about 12901.4691411482. The cubic root of 166447906 is about 550.0803254583.

The spelling of 166447906 in words is "one hundred sixty-six million, four hundred forty-seven thousand, nine hundred six".