67391893109 has 4 divisors (see below), whose sum is σ = 68663438316. Its totient is φ = 66120347904.

The previous prime is 67391893099. The next prime is 67391893123. The reversal of 67391893109 is 90139819376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25632970609 + 41758922500 = 160103^2 + 204350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67391893109 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67391899109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635772524 + ... + 635772629.

It is an arithmetic number, because the mean of its divisors is an integer number (17165859579).

Almost surely, 2^67391893109 is an apocalyptic number.

It is an amenable number.

67391893109 is a deficient number, since it is larger than the sum of its proper divisors (1271545207).

67391893109 is a wasteful number, since it uses less digits than its factorization.

67391893109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271545206.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 67391893109 in words is "sixty-seven billion, three hundred ninety-one million, eight hundred ninety-three thousand, one hundred nine".