166776966329 has 2 divisors, whose sum is σ = 166776966330. Its totient is φ = 166776966328.

The previous prime is 166776966313. The next prime is 166776966331. The reversal of 166776966329 is 923669677661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142766844025 + 24010122304 = 377845^2 + 154952^2 .

It is an emirp because it is prime and its reverse (923669677661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166776966329 - 2⁴ = 166776966313 is a prime.

Together with 166776966331, 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 (166776966529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83388483164 + 83388483165.

It is an arithmetic number, because the mean of its divisors is an integer number (83388483165).

Almost surely, 2^166776966329 is an apocalyptic number.

It is an amenable number.

166776966329 is a deficient number, since it is larger than the sum of its proper divisors (1).

166776966329 is an equidigital number, since it uses as much as digits as its factorization.

166776966329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185177664, while the sum is 68.

The spelling of 166776966329 in words is "one hundred sixty-six billion, seven hundred seventy-six million, nine hundred sixty-six thousand, three hundred twenty-nine".