67318719921 has 16 divisors (see below), whose sum is σ = 100253598720. Its totient is φ = 44644173840.

The previous prime is 67318719893. The next prime is 67318719929. The reversal of 67318719921 is 12991781376.

It is a happy number.

It is not a de Polignac number, because 67318719921 - 2⁵ = 67318719889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67318719929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6521770 + ... + 6532083.

It is an arithmetic number, because the mean of its divisors is an integer number (6265849920).

Almost surely, 2^67318719921 is an apocalyptic number.

It is an amenable number.

67318719921 is a deficient number, since it is larger than the sum of its proper divisors (32934878799).

67318719921 is a wasteful number, since it uses less digits than its factorization.

67318719921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13054053 (or 13054047 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The spelling of 67318719921 in words is "sixty-seven billion, three hundred eighteen million, seven hundred nineteen thousand, nine hundred twenty-one".