67989921723 has 16 divisors (see below), whose sum is σ = 100774717440. Its totient is φ = 45304606152.

The previous prime is 67989921709. The next prime is 67989921749. The reversal of 67989921723 is 32712998976.

It is not a de Polignac number, because 67989921723 - 2⁴ = 67989921707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67989921763) 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, 554611 + ... + 666012.

It is an arithmetic number, because the mean of its divisors is an integer number (6298419840).

Almost surely, 2^67989921723 is an apocalyptic number.

67989921723 is a deficient number, since it is larger than the sum of its proper divisors (32784795717).

67989921723 is a wasteful number, since it uses less digits than its factorization.

67989921723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222695 (or 1222689 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The spelling of 67989921723 in words is "sixty-seven billion, nine hundred eighty-nine million, nine hundred twenty-one thousand, seven hundred twenty-three".