8146802491781 has 2 divisors, whose sum is σ = 8146802491782. Its totient is φ = 8146802491780.

The previous prime is 8146802491777. The next prime is 8146802491783. The reversal of 8146802491781 is 1871942086418.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8146263555556 + 538936225 = 2854166^2 + 23215^2 .

It is a cyclic number.

It is not a de Polignac number, because 8146802491781 - 2² = 8146802491777 is a prime.

It is a super-2 number, since 2×8146802491781² (a number of 27 digits) contains 22 as substring.

Together with 8146802491783, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8146802491781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8146802491783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4073401245890 + 4073401245891.

It is an arithmetic number, because the mean of its divisors is an integer number (4073401245891).

Almost surely, 2^{8146802491781} is an apocalyptic number.

It is an amenable number.

8146802491781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8146802491781 is an equidigital number, since it uses as much as digits as its factorization.

8146802491781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6193152, while the sum is 59.

The spelling of 8146802491781 in words is "eight trillion, one hundred forty-six billion, eight hundred two million, four hundred ninety-one thousand, seven hundred eighty-one".