67543781449 has 8 divisors (see below), whose sum is σ = 67979592288. Its totient is φ = 67109357280.

The previous prime is 67543781399. The next prime is 67543781483. The reversal of 67543781449 is 94418734576.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67543781449 - 2²¹ = 67541684297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67543781393 and 67543781402.

It is not an unprimeable number, because it can be changed into a prime (67543788449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248847 + ... + 443860.

It is an arithmetic number, because the mean of its divisors is an integer number (8497449036).

Almost surely, 2^67543781449 is an apocalyptic number.

It is an amenable number.

67543781449 is a deficient number, since it is larger than the sum of its proper divisors (435810839).

67543781449 is a wasteful number, since it uses less digits than its factorization.

67543781449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693335.

The product of its digits is 20321280, while the sum is 58.

The spelling of 67543781449 in words is "sixty-seven billion, five hundred forty-three million, seven hundred eighty-one thousand, four hundred forty-nine".