38566379821 has 2 divisors, whose sum is σ = 38566379822. Its totient is φ = 38566379820.

The previous prime is 38566379801. The next prime is 38566379827. The reversal of 38566379821 is 12897366583.

38566379821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36858624196 + 1707755625 = 191986^2 + 41325^2 .

It is a cyclic number.

It is not a de Polignac number, because 38566379821 - 2⁹ = 38566379309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38566379827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19283189910 + 19283189911.

It is an arithmetic number, because the mean of its divisors is an integer number (19283189911).

Almost surely, 2^38566379821 is an apocalyptic number.

It is an amenable number.

38566379821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38566379821 is an equidigital number, since it uses as much as digits as its factorization.

38566379821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 58.

The spelling of 38566379821 in words is "thirty-eight billion, five hundred sixty-six million, three hundred seventy-nine thousand, eight hundred twenty-one".