38648942681 has 2 divisors, whose sum is σ = 38648942682. Its totient is φ = 38648942680.

The previous prime is 38648942639. The next prime is 38648942693. The reversal of 38648942681 is 18624984683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37487155456 + 1161787225 = 193616^2 + 34085^2 .

It is a cyclic number.

It is not a de Polignac number, because 38648942681 - 2¹⁰ = 38648941657 is a prime.

It is a super-2 number, since 2×38648942681² (a number of 22 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 38648942681.

It is not a weakly prime, because it can be changed into another prime (38648942581) 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, 19324471340 + 19324471341.

It is an arithmetic number, because the mean of its divisors is an integer number (19324471341).

Almost surely, 2^38648942681 is an apocalyptic number.

It is an amenable number.

38648942681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38648942681 is an equidigital number, since it uses as much as digits as its factorization.

38648942681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15925248, while the sum is 59.

The spelling of 38648942681 in words is "thirty-eight billion, six hundred forty-eight million, nine hundred forty-two thousand, six hundred eighty-one".