3838186956781 has 2 divisors, whose sum is σ = 3838186956782. Its totient is φ = 3838186956780.

The previous prime is 3838186956767. The next prime is 3838186956809. The reversal of 3838186956781 is 1876596818383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3801365184681 + 36821772100 = 1949709^2 + 191890^2 .

It is a cyclic number.

It is not a de Polignac number, because 3838186956781 - 2⁹ = 3838186956269 is a prime.

It is a super-2 number, since 2×3838186956781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3838186956481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1919093478390 + 1919093478391.

It is an arithmetic number, because the mean of its divisors is an integer number (1919093478391).

Almost surely, 2^{3838186956781} is an apocalyptic number.

It is an amenable number.

3838186956781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3838186956781 is an equidigital number, since it uses as much as digits as its factorization.

3838186956781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 418037760, while the sum is 73.

The spelling of 3838186956781 in words is "three trillion, eight hundred thirty-eight billion, one hundred eighty-six million, nine hundred fifty-six thousand, seven hundred eighty-one".