38781568381181 has 2 divisors, whose sum is σ = 38781568381182. Its totient is φ = 38781568381180.

The previous prime is 38781568381097. The next prime is 38781568381279. The reversal of 38781568381181 is 18118386518783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34090592851225 + 4690975529956 = 5838715^2 + 2165866^2 .

It is a cyclic number.

It is not a de Polignac number, because 38781568381181 - 2²⁶ = 38781501272317 is a prime.

It is a super-2 number, since 2×38781568381181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38781568381081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19390784190590 + 19390784190591.

It is an arithmetic number, because the mean of its divisors is an integer number (19390784190591).

Almost surely, 2^{38781568381181} is an apocalyptic number.

It is an amenable number.

38781568381181 is a deficient number, since it is larger than the sum of its proper divisors (1).

38781568381181 is an equidigital number, since it uses as much as digits as its factorization.

38781568381181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61931520, while the sum is 68.

The spelling of 38781568381181 in words is "thirty-eight trillion, seven hundred eighty-one billion, five hundred sixty-eight million, three hundred eighty-one thousand, one hundred eighty-one".