817012663 has 4 divisors (see below), whose sum is σ = 817099288. Its totient is φ = 816926040.

The previous prime is 817012643. The next prime is 817012723. The reversal of 817012663 is 366210718.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 366210718 = 2 ⋅183105359.

It is a cyclic number.

It is not a de Polignac number, because 817012663 - 2⁵ = 817012631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817012633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27156 + ... + 48697.

It is an arithmetic number, because the mean of its divisors is an integer number (204274822).

Almost surely, 2^817012663 is an apocalyptic number.

817012663 is a deficient number, since it is larger than the sum of its proper divisors (86625).

817012663 is a wasteful number, since it uses less digits than its factorization.

817012663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86624.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 817012663 is about 28583.4333662001. The cubic root of 817012663 is about 934.8521458753.

The spelling of 817012663 in words is "eight hundred seventeen million, twelve thousand, six hundred sixty-three".