67543788449 has 2 divisors, whose sum is σ = 67543788450. Its totient is φ = 67543788448.

The previous prime is 67543788443. The next prime is 67543788457. The reversal of 67543788449 is 94488734576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37357158400 + 30186630049 = 193280^2 + 173743^2 .

It is a cyclic number.

It is not a de Polignac number, because 67543788449 - 2¹² = 67543784353 is a prime.

It is not a weakly prime, because it can be changed into another prime (67543788443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33771894224 + 33771894225.

It is an arithmetic number, because the mean of its divisors is an integer number (33771894225).

Almost surely, 2^67543788449 is an apocalyptic number.

It is an amenable number.

67543788449 is a deficient number, since it is larger than the sum of its proper divisors (1).

67543788449 is an equidigital number, since it uses as much as digits as its factorization.

67543788449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162570240, while the sum is 65.

The spelling of 67543788449 in words is "sixty-seven billion, five hundred forty-three million, seven hundred eighty-eight thousand, four hundred forty-nine".