67394865943 has 4 divisors (see below), whose sum is σ = 71359269840. Its totient is φ = 63430462048.

The previous prime is 67394865929. The next prime is 67394865947. The reversal of 67394865943 is 34956849376.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67394865943 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 (67394865947) 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, 1982201923 + ... + 1982201956.

It is an arithmetic number, because the mean of its divisors is an integer number (17839817460).

Almost surely, 2^67394865943 is an apocalyptic number.

67394865943 is a deficient number, since it is larger than the sum of its proper divisors (3964403897).

67394865943 is a wasteful number, since it uses less digits than its factorization.

67394865943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964403896.

The product of its digits is 117573120, while the sum is 64.

The spelling of 67394865943 in words is "sixty-seven billion, three hundred ninety-four million, eight hundred sixty-five thousand, nine hundred forty-three".