68516666784 has 72 divisors (see below), whose sum is σ = 194910075360. Its totient is φ = 22831175808.

The previous prime is 68516666773. The next prime is 68516666789. The reversal of 68516666784 is 48766661586.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (68516666789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 848119 + ... + 925385.

It is an arithmetic number, because the mean of its divisors is an integer number (2707084380).

Almost surely, 2^68516666784 is an apocalyptic number.

It is an amenable number.

68516666784 is an abundant number, since it is smaller than the sum of its proper divisors (126393408576).

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

68516666784 is a wasteful number, since it uses less digits than its factorization.

68516666784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80362 (or 80351 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 68516666784 in words is "sixty-eight billion, five hundred sixteen million, six hundred sixty-six thousand, seven hundred eighty-four".