38685502217 has 2 divisors, whose sum is σ = 38685502218. Its totient is φ = 38685502216.

The previous prime is 38685502213. The next prime is 38685502223. The reversal of 38685502217 is 71220558683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38001993481 + 683508736 = 194941^2 + 26144^2 .

It is a cyclic number.

It is not a de Polignac number, because 38685502217 - 2² = 38685502213 is a prime.

It is not a weakly prime, because it can be changed into another prime (38685502213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19342751108 + 19342751109.

It is an arithmetic number, because the mean of its divisors is an integer number (19342751109).

Almost surely, 2^38685502217 is an apocalyptic number.

It is an amenable number.

38685502217 is a deficient number, since it is larger than the sum of its proper divisors (1).

38685502217 is an equidigital number, since it uses as much as digits as its factorization.

38685502217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 38685502217 in words is "thirty-eight billion, six hundred eighty-five million, five hundred two thousand, two hundred seventeen".