671206156236769 has 2 divisors, whose sum is σ = 671206156236770. Its totient is φ = 671206156236768.

The previous prime is 671206156236713. The next prime is 671206156236799. The reversal of 671206156236769 is 967632651602176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453890796012369 + 217315360224400 = 21304713^2 + 14741620^2 .

It is a cyclic number.

It is not a de Polignac number, because 671206156236769 - 2¹¹ = 671206156234721 is a prime.

It is a super-2 number, since 2×671206156236769² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671206156236799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335603078118384 + 335603078118385.

It is an arithmetic number, because the mean of its divisors is an integer number (335603078118385).

Almost surely, 2^{671206156236769} is an apocalyptic number.

It is an amenable number.

671206156236769 is a deficient number, since it is larger than the sum of its proper divisors (1).

671206156236769 is an equidigital number, since it uses as much as digits as its factorization.

671206156236769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 205752960, while the sum is 67.

The spelling of 671206156236769 in words is "six hundred seventy-one trillion, two hundred six billion, one hundred fifty-six million, two hundred thirty-six thousand, seven hundred sixty-nine".