13315854562781 has 2 divisors, whose sum is σ = 13315854562782. Its totient is φ = 13315854562780.

The previous prime is 13315854562771. The next prime is 13315854562807. The reversal of 13315854562781 is 18726545851331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13127034765625 + 188819797156 = 3623125^2 + 434534^2 .

It is a cyclic number.

It is not a de Polignac number, because 13315854562781 - 2²² = 13315850368477 is a prime.

It is a super-3 number, since 3×13315854562781³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 13315854562781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13315854562771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6657927281390 + 6657927281391.

It is an arithmetic number, because the mean of its divisors is an integer number (6657927281391).

Almost surely, 2^{13315854562781} is an apocalyptic number.

It is an amenable number.

13315854562781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13315854562781 is an equidigital number, since it uses as much as digits as its factorization.

13315854562781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192000, while the sum is 59.

The spelling of 13315854562781 in words is "thirteen trillion, three hundred fifteen billion, eight hundred fifty-four million, five hundred sixty-two thousand, seven hundred eighty-one".