817800330040 has 16 divisors (see below), whose sum is σ = 1840050742680. Its totient is φ = 327120132000.

The previous prime is 817800330023. The next prime is 817800330043. The reversal of 817800330040 is 40033008718.

It is a junction number, because it is equal to n+sod(n) for n = 817800329978 and 817800330005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817800330043) 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, 10222504086 + ... + 10222504165.

Almost surely, 2^817800330040 is an apocalyptic number.

It is an amenable number.

817800330040 is an abundant number, since it is smaller than the sum of its proper divisors (1022250412640).

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

817800330040 is a wasteful number, since it uses less digits than its factorization.

817800330040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20445008262 (or 20445008258 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

Adding to 817800330040 its reverse (40033008718), we get a palindrome (857833338758).

The spelling of 817800330040 in words is "eight hundred seventeen billion, eight hundred million, three hundred thirty thousand, forty".