68518336815 has 12 divisors (see below), whose sum is σ = 118765117224. Its totient is φ = 36543112944.

The previous prime is 68518336763. The next prime is 68518336853. The reversal of 68518336815 is 51863381586.

68518336815 is a `hidden beast` number, since 68 + 518 + 3 + 3 + 68 + 1 + 5 = 666.

It is not a de Polignac number, because 68518336815 - 2¹⁰ = 68518335791 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 761314809 + ... + 761314898.

It is an arithmetic number, because the mean of its divisors is an integer number (9897093102).

Almost surely, 2^68518336815 is an apocalyptic number.

68518336815 is a deficient number, since it is larger than the sum of its proper divisors (50246780409).

68518336815 is a wasteful number, since it uses less digits than its factorization.

68518336815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522629718 (or 1522629715 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 68518336815 in words is "sixty-eight billion, five hundred eighteen million, three hundred thirty-six thousand, eight hundred fifteen".