166776773213 has 2 divisors, whose sum is σ = 166776773214. Its totient is φ = 166776773212.

The previous prime is 166776773197. The next prime is 166776773279. The reversal of 166776773213 is 312377677661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124166731129 + 42610042084 = 352373^2 + 206422^2 .

It is a cyclic number.

It is not a de Polignac number, because 166776773213 - 2⁴ = 166776773197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166776775213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83388386606 + 83388386607.

It is an arithmetic number, because the mean of its divisors is an integer number (83388386607).

Almost surely, 2^166776773213 is an apocalyptic number.

It is an amenable number.

166776773213 is a deficient number, since it is larger than the sum of its proper divisors (1).

166776773213 is an equidigital number, since it uses as much as digits as its factorization.

166776773213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9335088, while the sum is 56.

The spelling of 166776773213 in words is "one hundred sixty-six billion, seven hundred seventy-six million, seven hundred seventy-three thousand, two hundred thirteen".