817280231679 has 12 divisors (see below), whose sum is σ = 1184687328136. Its totient is φ = 542928208752.

The previous prime is 817280231623. The next prime is 817280231681. The reversal of 817280231679 is 976132082718.

It is a happy number.

It is not a de Polignac number, because 817280231679 - 2⁹ = 817280231167 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 (817280231689) 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, 160437232 + ... + 160442325.

Almost surely, 2^817280231679 is an apocalyptic number.

817280231679 is a deficient number, since it is larger than the sum of its proper divisors (367407096457).

817280231679 is a wasteful number, since it uses less digits than its factorization.

817280231679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320879846 (or 320879843 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 817280231679 in words is "eight hundred seventeen billion, two hundred eighty million, two hundred thirty-one thousand, six hundred seventy-nine".