38748748781 has 2 divisors, whose sum is σ = 38748748782. Its totient is φ = 38748748780.

The previous prime is 38748748757. The next prime is 38748748783. The reversal of 38748748781 is 18784784783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36157022500 + 2591726281 = 190150^2 + 50909^2 .

It is a cyclic number.

It is not a de Polignac number, because 38748748781 - 2¹⁰ = 38748747757 is a prime.

It is a super-2 number, since 2×38748748781² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 38748748783, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38748748783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19374374390 + 19374374391.

It is an arithmetic number, because the mean of its divisors is an integer number (19374374391).

Almost surely, 2^38748748781 is an apocalyptic number.

It is an amenable number.

38748748781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38748748781 is an equidigital number, since it uses as much as digits as its factorization.

38748748781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67436544, while the sum is 65.

The spelling of 38748748781 in words is "thirty-eight billion, seven hundred forty-eight million, seven hundred forty-eight thousand, seven hundred eighty-one".