38721134864857 has 2 divisors, whose sum is σ = 38721134864858. Its totient is φ = 38721134864856.

The previous prime is 38721134864779. The next prime is 38721134864873. The reversal of 38721134864857 is 75846843112783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22379134574281 + 16342000290576 = 4730659^2 + 4042524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38721134864857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 38721134864792 and 38721134864801.

It is not a weakly prime, because it can be changed into another prime (38721134864897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360567432428 + 19360567432429.

It is an arithmetic number, because the mean of its divisors is an integer number (19360567432429).

Almost surely, 2^{38721134864857} is an apocalyptic number.

It is an amenable number.

38721134864857 is a deficient number, since it is larger than the sum of its proper divisors (1).

38721134864857 is an equidigital number, since it uses as much as digits as its factorization.

38721134864857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216760320, while the sum is 67.

The spelling of 38721134864857 in words is "thirty-eight trillion, seven hundred twenty-one billion, one hundred thirty-four million, eight hundred sixty-four thousand, eight hundred fifty-seven".