388065840881 has 2 divisors, whose sum is σ = 388065840882. Its totient is φ = 388065840880.

The previous prime is 388065840863. The next prime is 388065840907. The reversal of 388065840881 is 188048560883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378698698225 + 9367142656 = 615385^2 + 96784^2 .

It is an emirp because it is prime and its reverse (188048560883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388065840881 - 2¹⁸ = 388065578737 is a prime.

It is a super-2 number, since 2×388065840881² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 388065840881.

It is not a weakly prime, because it can be changed into another prime (388065840821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194032920440 + 194032920441.

It is an arithmetic number, because the mean of its divisors is an integer number (194032920441).

Almost surely, 2^388065840881 is an apocalyptic number.

It is an amenable number.

388065840881 is a deficient number, since it is larger than the sum of its proper divisors (1).

388065840881 is an equidigital number, since it uses as much as digits as its factorization.

388065840881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11796480, while the sum is 59.

The spelling of 388065840881 in words is "three hundred eighty-eight billion, sixty-five million, eight hundred forty thousand, eight hundred eighty-one".