68985886921 has 16 divisors (see below), whose sum is σ = 81708576768. Its totient is φ = 56995290000.

The previous prime is 68985886913. The next prime is 68985886943. The reversal of 68985886921 is 12968858986.

It is a cyclic number.

It is not a de Polignac number, because 68985886921 - 2³ = 68985886913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68985886951) 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, 578815 + ... + 687748.

It is an arithmetic number, because the mean of its divisors is an integer number (5106786048).

Almost surely, 2^68985886921 is an apocalyptic number.

It is an amenable number.

68985886921 is a deficient number, since it is larger than the sum of its proper divisors (12722689847).

68985886921 is a wasteful number, since it uses less digits than its factorization.

68985886921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266852.

The product of its digits is 119439360, while the sum is 70.

The spelling of 68985886921 in words is "sixty-eight billion, nine hundred eighty-five million, eight hundred eighty-six thousand, nine hundred twenty-one".