68035391887 has 4 divisors (see below), whose sum is σ = 68082672960. Its totient is φ = 67988110816.

The previous prime is 68035391861. The next prime is 68035391927. The reversal of 68035391887 is 78819353086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68035391887 - 2¹¹ = 68035389839 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68035391687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23638378 + ... + 23641255.

It is an arithmetic number, because the mean of its divisors is an integer number (17020668240).

Almost surely, 2^68035391887 is an apocalyptic number.

68035391887 is a deficient number, since it is larger than the sum of its proper divisors (47281073).

68035391887 is a wasteful number, since it uses less digits than its factorization.

68035391887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47281072.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 68035391887 in words is "sixty-eight billion, thirty-five million, three hundred ninety-one thousand, eight hundred eighty-seven".