12002168755781 has 2 divisors, whose sum is σ = 12002168755782. Its totient is φ = 12002168755780.

The previous prime is 12002168755763. The next prime is 12002168755783. The reversal of 12002168755781 is 18755786120021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10007763885025 + 1994404870756 = 3163505^2 + 1412234^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002168755781 - 2³⁴ = 11984988886597 is a prime.

It is a super-2 number, since 2×12002168755781² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 12002168755783, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12002168755783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001084377890 + 6001084377891.

It is an arithmetic number, because the mean of its divisors is an integer number (6001084377891).

Almost surely, 2^{12002168755781} is an apocalyptic number.

It is an amenable number.

12002168755781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12002168755781 is an equidigital number, since it uses as much as digits as its factorization.

12002168755781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 12002168755781 in words is "twelve trillion, two billion, one hundred sixty-eight million, seven hundred fifty-five thousand, seven hundred eighty-one".