68388904391 has 8 divisors (see below), whose sum is σ = 70245436800. Its totient is φ = 66544467192.

The previous prime is 68388904357. The next prime is 68388904417. The reversal of 68388904391 is 19340988386.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68388904391 - 2⁶ = 68388904327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68388904391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68388904321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3012341 + ... + 3034958.

It is an arithmetic number, because the mean of its divisors is an integer number (8780679600).

Almost surely, 2^68388904391 is an apocalyptic number.

68388904391 is a deficient number, since it is larger than the sum of its proper divisors (1856532409).

68388904391 is a wasteful number, since it uses less digits than its factorization.

68388904391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6047605.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 68388904391 in words is "sixty-eight billion, three hundred eighty-eight million, nine hundred four thousand, three hundred ninety-one".