517820117208 has 32 divisors (see below), whose sum is σ = 1295278902960. Its totient is φ = 172509557760.

The previous prime is 517820117207. The next prime is 517820117209. The reversal of 517820117208 is 802711028715.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (517820117207) and next prime (517820117209).

It is a self number, because there is not a number n which added to its sum of digits gives 517820117208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517820117207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6028213 + ... + 6113508.

Almost surely, 2^517820117208 is an apocalyptic number.

It is an amenable number.

517820117208 is an abundant number, since it is smaller than the sum of its proper divisors (777458785752).

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

517820117208 is a wasteful number, since it uses less digits than its factorization.

517820117208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12143507 (or 12143503 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 42.

The spelling of 517820117208 in words is "five hundred seventeen billion, eight hundred twenty million, one hundred seventeen thousand, two hundred eight".