38871978833 has 2 divisors, whose sum is σ = 38871978834. Its totient is φ = 38871978832.

The previous prime is 38871978809. The next prime is 38871978877. The reversal of 38871978833 is 33887917883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38642516929 + 229461904 = 196577^2 + 15148^2 .

It is a cyclic number.

It is not a de Polignac number, because 38871978833 - 2⁸ = 38871978577 is a prime.

It is a super-2 number, since 2×38871978833² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38871978833.

It is not a weakly prime, because it can be changed into another prime (38811978833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19435989416 + 19435989417.

It is an arithmetic number, because the mean of its divisors is an integer number (19435989417).

Almost surely, 2^38871978833 is an apocalyptic number.

It is an amenable number.

38871978833 is a deficient number, since it is larger than the sum of its proper divisors (1).

38871978833 is an equidigital number, since it uses as much as digits as its factorization.

38871978833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 65.

The spelling of 38871978833 in words is "thirty-eight billion, eight hundred seventy-one million, nine hundred seventy-eight thousand, eight hundred thirty-three".