166776775271 has 2 divisors, whose sum is σ = 166776775272. Its totient is φ = 166776775270.

The previous prime is 166776775261. The next prime is 166776775327. The reversal of 166776775271 is 172577677661.

It is a weak prime.

It is an emirp because it is prime and its reverse (172577677661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166776775271 - 2¹⁴ = 166776758887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166776775261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83388387635 + 83388387636.

It is an arithmetic number, because the mean of its divisors is an integer number (83388387636).

Almost surely, 2^166776775271 is an apocalyptic number.

166776775271 is a deficient number, since it is larger than the sum of its proper divisors (1).

166776775271 is an equidigital number, since it uses as much as digits as its factorization.

166776775271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36303120, while the sum is 62.

The spelling of 166776775271 in words is "one hundred sixty-six billion, seven hundred seventy-six million, seven hundred seventy-five thousand, two hundred seventy-one".