67878737909 has 2 divisors, whose sum is σ = 67878737910. Its totient is φ = 67878737908.

The previous prime is 67878737887. The next prime is 67878737921. The reversal of 67878737909 is 90973787876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64860883684 + 3017854225 = 254678^2 + 54935^2 .

It is a cyclic number.

It is not a de Polignac number, because 67878737909 - 2²⁸ = 67610302453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67878737989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33939368954 + 33939368955.

It is an arithmetic number, because the mean of its divisors is an integer number (33939368955).

Almost surely, 2^67878737909 is an apocalyptic number.

It is an amenable number.

67878737909 is a deficient number, since it is larger than the sum of its proper divisors (1).

67878737909 is an equidigital number, since it uses as much as digits as its factorization.

67878737909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224042112, while the sum is 71.

The spelling of 67878737909 in words is "sixty-seven billion, eight hundred seventy-eight million, seven hundred thirty-seven thousand, nine hundred nine".