67889694449 has 2 divisors, whose sum is σ = 67889694450. Its totient is φ = 67889694448.

The previous prime is 67889694437. The next prime is 67889694451. The reversal of 67889694449 is 94449698876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62728708849 + 5160985600 = 250457^2 + 71840^2 .

It is a cyclic number.

It is not a de Polignac number, because 67889694449 - 2⁸ = 67889694193 is a prime.

It is a super-2 number, since 2×67889694449² (a number of 22 digits) contains 22 as substring.

Together with 67889694451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67889694419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33944847224 + 33944847225.

It is an arithmetic number, because the mean of its divisors is an integer number (33944847225).

Almost surely, 2^67889694449 is an apocalyptic number.

It is an amenable number.

67889694449 is a deficient number, since it is larger than the sum of its proper divisors (1).

67889694449 is an equidigital number, since it uses as much as digits as its factorization.

67889694449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752467968, while the sum is 74.

The spelling of 67889694449 in words is "sixty-seven billion, eight hundred eighty-nine million, six hundred ninety-four thousand, four hundred forty-nine".