38251778813 has 2 divisors, whose sum is σ = 38251778814. Its totient is φ = 38251778812.

The previous prime is 38251778777. The next prime is 38251778839. The reversal of 38251778813 is 31887715283.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21121680889 + 17130097924 = 145333^2 + 130882^2 .

It is a cyclic number.

It is not a de Polignac number, because 38251778813 - 2³⁰ = 37178036989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38251778893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19125889406 + 19125889407.

It is an arithmetic number, because the mean of its divisors is an integer number (19125889407).

Almost surely, 2^38251778813 is an apocalyptic number.

It is an amenable number.

38251778813 is a deficient number, since it is larger than the sum of its proper divisors (1).

38251778813 is an equidigital number, since it uses as much as digits as its factorization.

38251778813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 53.

The spelling of 38251778813 in words is "thirty-eight billion, two hundred fifty-one million, seven hundred seventy-eight thousand, eight hundred thirteen".