38561340637 has 2 divisors, whose sum is σ = 38561340638. Its totient is φ = 38561340636.

The previous prime is 38561340613. The next prime is 38561340641. The reversal of 38561340637 is 73604316583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34206132601 + 4355208036 = 184949^2 + 65994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38561340637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38561343637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19280670318 + 19280670319.

It is an arithmetic number, because the mean of its divisors is an integer number (19280670319).

Almost surely, 2^38561340637 is an apocalyptic number.

It is an amenable number.

38561340637 is a deficient number, since it is larger than the sum of its proper divisors (1).

38561340637 is an equidigital number, since it uses as much as digits as its factorization.

38561340637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 38561340637 in words is "thirty-eight billion, five hundred sixty-one million, three hundred forty thousand, six hundred thirty-seven".