38491647817 has 12 divisors (see below), whose sum is σ = 44820432660. Its totient is φ = 32960100096.

The previous prime is 38491647811. The next prime is 38491647841. The reversal of 38491647817 is 71874619483.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22665001401 + 15826646416 = 150549^2 + 125804^2 .

It is a de Polignac number, because none of the positive numbers 2^k-38491647817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38491647811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339828 + ... + 438709.

It is an arithmetic number, because the mean of its divisors is an integer number (3735036055).

Almost surely, 2^38491647817 is an apocalyptic number.

It is an amenable number.

38491647817 is a deficient number, since it is larger than the sum of its proper divisors (6328784843).

38491647817 is a wasteful number, since it uses less digits than its factorization.

38491647817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779560 (or 779553 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The spelling of 38491647817 in words is "thirty-eight billion, four hundred ninety-one million, six hundred forty-seven thousand, eight hundred seventeen".