68508938491 has 16 divisors (see below), whose sum is σ = 79718284800. Its totient is φ = 57657564288.

The previous prime is 68508938441. The next prime is 68508938501. The reversal of 68508938491 is 19483980586.

It is a cyclic number.

It is not a de Polignac number, because 68508938491 - 2¹⁹ = 68508414203 is a prime.

It is a super-3 number, since 3×68508938491³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (68508938441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247651 + ... + 445363.

It is an arithmetic number, because the mean of its divisors is an integer number (4982392800).

Almost surely, 2^68508938491 is an apocalyptic number.

68508938491 is a deficient number, since it is larger than the sum of its proper divisors (11209346309).

68508938491 is a wasteful number, since it uses less digits than its factorization.

68508938491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198618.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 68508938491 in words is "sixty-eight billion, five hundred eight million, nine hundred thirty-eight thousand, four hundred ninety-one".