38456378581 has 2 divisors, whose sum is σ = 38456378582. Its totient is φ = 38456378580.

The previous prime is 38456378563. The next prime is 38456378591. The reversal of 38456378581 is 18587365483.

It is a happy number.

38456378581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38432073681 + 24304900 = 196041^2 + 4930^2 .

It is an emirp because it is prime and its reverse (18587365483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38456378581 is a prime.

It is a super-2 number, since 2×38456378581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38456378591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19228189290 + 19228189291.

It is an arithmetic number, because the mean of its divisors is an integer number (19228189291).

Almost surely, 2^38456378581 is an apocalyptic number.

It is an amenable number.

38456378581 is a deficient number, since it is larger than the sum of its proper divisors (1).

38456378581 is an equidigital number, since it uses as much as digits as its factorization.

38456378581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19353600, while the sum is 58.

The spelling of 38456378581 in words is "thirty-eight billion, four hundred fifty-six million, three hundred seventy-eight thousand, five hundred eighty-one".