166129979 has 2 divisors, whose sum is σ = 166129980. Its totient is φ = 166129978.

The previous prime is 166129927. The next prime is 166129993. The reversal of 166129979 is 979921661.

It is a strong prime.

It is an emirp because it is prime and its reverse (979921661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166129979 is a prime.

It is not a weakly prime, because it can be changed into another prime (166129679) 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 as a sum of consecutive naturals, namely, 83064989 + 83064990.

It is an arithmetic number, because the mean of its divisors is an integer number (83064990).

Almost surely, 2^166129979 is an apocalyptic number.

166129979 is a deficient number, since it is larger than the sum of its proper divisors (1).

166129979 is an equidigital number, since it uses as much as digits as its factorization.

166129979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 50.

The square root of 166129979 is about 12889.1419031680. The cubic root of 166129979 is about 549.7298717580.

The spelling of 166129979 in words is "one hundred sixty-six million, one hundred twenty-nine thousand, nine hundred seventy-nine".