18941782051813 has 2 divisors, whose sum is σ = 18941782051814. Its totient is φ = 18941782051812.

The previous prime is 18941782051781. The next prime is 18941782051817. The reversal of 18941782051813 is 31815028714981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10053167272929 + 8888614778884 = 3170673^2 + 2981378^2 .

It is a cyclic number.

It is not a de Polignac number, because 18941782051813 - 2⁵ = 18941782051781 is a prime.

It is a super-2 number, since 2×18941782051813² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18941782051817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470891025906 + 9470891025907.

It is an arithmetic number, because the mean of its divisors is an integer number (9470891025907).

Almost surely, 2^{18941782051813} is an apocalyptic number.

It is an amenable number.

18941782051813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18941782051813 is an equidigital number, since it uses as much as digits as its factorization.

18941782051813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 58.

The spelling of 18941782051813 in words is "eighteen trillion, nine hundred forty-one billion, seven hundred eighty-two million, fifty-one thousand, eight hundred thirteen".