67981323477 has 16 divisors (see below), whose sum is σ = 96305742720. Its totient is φ = 42654938816.

The previous prime is 67981323469. The next prime is 67981323497. The reversal of 67981323477 is 77432318976.

It is a happy number.

It is not a de Polignac number, because 67981323477 - 2³ = 67981323469 is a prime.

It is a super-2 number, since 2×67981323477² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67981323407) 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, 2291433 + ... + 2320910.

It is an arithmetic number, because the mean of its divisors is an integer number (6019108920).

Almost surely, 2^67981323477 is an apocalyptic number.

It is an amenable number.

67981323477 is a deficient number, since it is larger than the sum of its proper divisors (28324419243).

67981323477 is an equidigital number, since it uses as much as digits as its factorization.

67981323477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612397 (or 4612363 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 57.

The spelling of 67981323477 in words is "sixty-seven billion, nine hundred eighty-one million, three hundred twenty-three thousand, four hundred seventy-seven".