166129993 has 2 divisors, whose sum is σ = 166129994. Its totient is φ = 166129992.

The previous prime is 166129979. The next prime is 166130033. The reversal of 166129993 is 399921661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163021824 + 3108169 = 12768^2 + 1763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166129993 is a prime.

It is not a weakly prime, because it can be changed into another prime (166129193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83064996 + 83064997.

It is an arithmetic number, because the mean of its divisors is an integer number (83064997).

Almost surely, 2^166129993 is an apocalyptic number.

It is an amenable number.

166129993 is a deficient number, since it is larger than the sum of its proper divisors (1).

166129993 is an equidigital number, since it uses as much as digits as its factorization.

166129993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 46.

The square root of 166129993 is about 12889.1424462607. The cubic root of 166129993 is about 549.7298872002.

The spelling of 166129993 in words is "one hundred sixty-six million, one hundred twenty-nine thousand, nine hundred ninety-three".