67840549814449 has 2 divisors, whose sum is σ = 67840549814450. Its totient is φ = 67840549814448.

The previous prime is 67840549814447. The next prime is 67840549814461. The reversal of 67840549814449 is 94441894504876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67831811304049 + 8738510400 = 8236007^2 + 93480^2 .

It is a cyclic number.

It is not a de Polignac number, because 67840549814449 - 2¹ = 67840549814447 is a prime.

Together with 67840549814447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67840549814447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33920274907224 + 33920274907225.

It is an arithmetic number, because the mean of its divisors is an integer number (33920274907225).

Almost surely, 2^{67840549814449} is an apocalyptic number.

It is an amenable number.

67840549814449 is a deficient number, since it is larger than the sum of its proper divisors (1).

67840549814449 is an equidigital number, since it uses as much as digits as its factorization.

67840549814449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1114767360, while the sum is 73.

The spelling of 67840549814449 in words is "sixty-seven trillion, eight hundred forty billion, five hundred forty-nine million, eight hundred fourteen thousand, four hundred forty-nine".