166129174909 has 2 divisors, whose sum is σ = 166129174910. Its totient is φ = 166129174908.

The previous prime is 166129174901. The next prime is 166129174921. The reversal of 166129174909 is 909471921661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158591115225 + 7538059684 = 398235^2 + 86822^2 .

It is a cyclic number.

It is not a de Polignac number, because 166129174909 - 2³ = 166129174901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166129174909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166129174901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83064587454 + 83064587455.

It is an arithmetic number, because the mean of its divisors is an integer number (83064587455).

Almost surely, 2^166129174909 is an apocalyptic number.

It is an amenable number.

166129174909 is a deficient number, since it is larger than the sum of its proper divisors (1).

166129174909 is an equidigital number, since it uses as much as digits as its factorization.

166129174909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 166129174909 in words is "one hundred sixty-six billion, one hundred twenty-nine million, one hundred seventy-four thousand, nine hundred nine".