68785447821 has 16 divisors (see below), whose sum is σ = 97279574400. Its totient is φ = 43083627008.

The previous prime is 68785447807. The next prime is 68785447837. The reversal of 68785447821 is 12874458786.

It is a cyclic number.

It is not a de Polignac number, because 68785447821 - 2¹³ = 68785439629 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68785447321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1156161 + ... + 1214198.

It is an arithmetic number, because the mean of its divisors is an integer number (6079973400).

Almost surely, 2^68785447821 is an apocalyptic number.

It is an amenable number.

68785447821 is a deficient number, since it is larger than the sum of its proper divisors (28494126579).

68785447821 is a wasteful number, since it uses less digits than its factorization.

68785447821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370948.

The product of its digits is 24084480, while the sum is 60.

The spelling of 68785447821 in words is "sixty-eight billion, seven hundred eighty-five million, four hundred forty-seven thousand, eight hundred twenty-one".