67989774989 has 4 divisors (see below), whose sum is σ = 68662941180. Its totient is φ = 67316608800.

The previous prime is 67989774943. The next prime is 67989775001. The reversal of 67989774989 is 98947798976.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29443128100 + 38546646889 = 171590^2 + 196333^2 .

It is a cyclic number.

It is not a de Polignac number, because 67989774989 - 2¹⁶ = 67989709453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67989773989) 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 3 ways as a sum of consecutive naturals, for example, 336582944 + ... + 336583145.

It is an arithmetic number, because the mean of its divisors is an integer number (17165735295).

Almost surely, 2^67989774989 is an apocalyptic number.

It is an amenable number.

67989774989 is a deficient number, since it is larger than the sum of its proper divisors (673166191).

67989774989 is a wasteful number, since it uses less digits than its factorization.

67989774989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673166190.

The product of its digits is 3456649728, while the sum is 83.

The spelling of 67989774989 in words is "sixty-seven billion, nine hundred eighty-nine million, seven hundred seventy-four thousand, nine hundred eighty-nine".