817797989712 has 120 divisors (see below), whose sum is σ = 2378802121920. Its totient is φ = 241773171200.

The previous prime is 817797989693. The next prime is 817797989713. The reversal of 817797989712 is 217989797718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817797989713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1479012 + ... + 1955267.

It is an arithmetic number, because the mean of its divisors is an integer number (19823351016).

Almost surely, 2^817797989712 is an apocalyptic number.

817797989712 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

817797989712 is an abundant number, since it is smaller than the sum of its proper divisors (1561004132208).

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

817797989712 is a wasteful number, since it uses less digits than its factorization.

817797989712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3434353 (or 3434336 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 75.

The spelling of 817797989712 in words is "eight hundred seventeen billion, seven hundred ninety-seven million, nine hundred eighty-nine thousand, seven hundred twelve".