38637644663 has 2 divisors, whose sum is σ = 38637644664. Its totient is φ = 38637644662.

The previous prime is 38637644651. The next prime is 38637644677. The reversal of 38637644663 is 36644673683.

It is a weak prime.

It is an emirp because it is prime and its reverse (36644673683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38637644663 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 38637644599 and 38637644608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38637640663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19318822331 + 19318822332.

It is an arithmetic number, because the mean of its divisors is an integer number (19318822332).

Almost surely, 2^38637644663 is an apocalyptic number.

38637644663 is a deficient number, since it is larger than the sum of its proper divisors (1).

38637644663 is an equidigital number, since it uses as much as digits as its factorization.

38637644663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 56.

The spelling of 38637644663 in words is "thirty-eight billion, six hundred thirty-seven million, six hundred forty-four thousand, six hundred sixty-three".