166680987706 has 8 divisors (see below), whose sum is σ = 252599022900. Its totient is φ = 82481313408.

The previous prime is 166680987701. The next prime is 166680987713. The reversal of 166680987706 is 607789086661.

166680987706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 166476240225 + 204747481 = 408015^2 + 14309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166680987701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429589981 + ... + 429590368.

Almost surely, 2^166680987706 is an apocalyptic number.

166680987706 is a deficient number, since it is larger than the sum of its proper divisors (85918035194).

166680987706 is an equidigital number, since it uses as much as digits as its factorization.

166680987706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859180448.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 166680987706 in words is "one hundred sixty-six billion, six hundred eighty million, nine hundred eighty-seven thousand, seven hundred six".