166679729 has 2 divisors, whose sum is σ = 166679730. Its totient is φ = 166679728.

The previous prime is 166679717. The next prime is 166679731. The reversal of 166679729 is 927976661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95023504 + 71656225 = 9748^2 + 8465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166679729 is a prime.

Together with 166679731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166679749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83339864 + 83339865.

It is an arithmetic number, because the mean of its divisors is an integer number (83339865).

Almost surely, 2^166679729 is an apocalyptic number.

It is an amenable number.

166679729 is a deficient number, since it is larger than the sum of its proper divisors (1).

166679729 is an equidigital number, since it uses as much as digits as its factorization.

166679729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 166679729 is about 12910.4503794407. The cubic root of 166679729 is about 550.3355847317.

The spelling of 166679729 in words is "one hundred sixty-six million, six hundred seventy-nine thousand, seven hundred twenty-nine".