817478851344 has 20 divisors (see below), whose sum is σ = 2111820366096. Its totient is φ = 272492950432.

The previous prime is 817478851339. The next prime is 817478851349. The reversal of 817478851344 is 443158874718.

It is an interprime number because it is at equal distance from previous prime (817478851339) and next prime (817478851349).

It is not an unprimeable number, because it can be changed into a prime (817478851349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8515404654 + ... + 8515404749.

Almost surely, 2^817478851344 is an apocalyptic number.

It is an amenable number.

817478851344 is an abundant number, since it is smaller than the sum of its proper divisors (1294341514752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

817478851344 is a wasteful number, since it uses less digits than its factorization.

817478851344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17030809414 (or 17030809408 counting only the distinct ones).

The product of its digits is 24084480, while the sum is 60.

The spelling of 817478851344 in words is "eight hundred seventeen billion, four hundred seventy-eight million, eight hundred fifty-one thousand, three hundred forty-four".