166400012 has 12 divisors (see below), whose sum is σ = 308329560. Its totient is φ = 78305856.

The previous prime is 166399993. The next prime is 166400021. The reversal of 166400012 is 210004661.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223462 + ... + 1223597.

It is an arithmetic number, because the mean of its divisors is an integer number (25694130).

Almost surely, 2^166400012 is an apocalyptic number.

It is an amenable number.

166400012 is a deficient number, since it is larger than the sum of its proper divisors (141929548).

166400012 is a wasteful number, since it uses less digits than its factorization.

166400012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447080 (or 2447078 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 166400012 is about 12899.6128624079. The cubic root of 166400012 is about 550.0275600515.

Adding to 166400012 its reverse (210004661), we get a palindrome (376404673).

The spelling of 166400012 in words is "one hundred sixty-six million, four hundred thousand, twelve".