12517806805 has 48 divisors (see below), whose sum is σ = 17908805376. Its totient is φ = 8371278720.

The previous prime is 12517806797. The next prime is 12517806817. The reversal of 12517806805 is 50860871521.

It is not a de Polignac number, because 12517806805 - 2³ = 12517806797 is a prime.

It is a super-3 number, since 3×12517806805³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3533335 + ... + 3536875.

It is an arithmetic number, because the mean of its divisors is an integer number (373100112).

Almost surely, 2^12517806805 is an apocalyptic number.

It is an amenable number.

12517806805 is a deficient number, since it is larger than the sum of its proper divisors (5390998571).

12517806805 is a wasteful number, since it uses less digits than its factorization.

12517806805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914 (or 3907 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 12517806805 in words is "twelve billion, five hundred seventeen million, eight hundred six thousand, eight hundred five".