166680390 has 32 divisors (see below), whose sum is σ = 401149440. Its totient is φ = 44324064.

The previous prime is 166680383. The next prime is 166680391. The reversal of 166680390 is 93086661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166680391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3441 + ... + 18579.

It is an arithmetic number, because the mean of its divisors is an integer number (12535920).

Almost surely, 2^166680390 is an apocalyptic number.

166680390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166680390 is an abundant number, since it is smaller than the sum of its proper divisors (234469050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166680390 is a wasteful number, since it uses less digits than its factorization.

166680390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15516.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 166680390 is about 12910.4759788321. The cubic root of 166680390 is about 550.3363122173.

The spelling of 166680390 in words is "one hundred sixty-six million, six hundred eighty thousand, three hundred ninety".