67979878909 has 2 divisors, whose sum is σ = 67979878910. Its totient is φ = 67979878908.

The previous prime is 67979878871. The next prime is 67979878913. The reversal of 67979878909 is 90987897976.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54795787225 + 13184091684 = 234085^2 + 114822^2 .

It is a cyclic number.

It is not a de Polignac number, because 67979878909 - 2⁹ = 67979878397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67979878969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33989939454 + 33989939455.

It is an arithmetic number, because the mean of its divisors is an integer number (33989939455).

Almost surely, 2^67979878909 is an apocalyptic number.

It is an amenable number.

67979878909 is a deficient number, since it is larger than the sum of its proper divisors (1).

67979878909 is an equidigital number, since it uses as much as digits as its factorization.

67979878909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864162432, while the sum is 79.

The spelling of 67979878909 in words is "sixty-seven billion, nine hundred seventy-nine million, eight hundred seventy-eight thousand, nine hundred nine".