78936721727 has 2 divisors, whose sum is σ = 78936721728. Its totient is φ = 78936721726.

The previous prime is 78936721649. The next prime is 78936721733. The reversal of 78936721727 is 72712763987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78936721727 - 2¹⁶ = 78936656191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78936720727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468360863 + 39468360864.

It is an arithmetic number, because the mean of its divisors is an integer number (39468360864).

Almost surely, 2^78936721727 is an apocalyptic number.

78936721727 is a deficient number, since it is larger than the sum of its proper divisors (1).

78936721727 is an equidigital number, since it uses as much as digits as its factorization.

78936721727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12446784, while the sum is 59.

The spelling of 78936721727 in words is "seventy-eight billion, nine hundred thirty-six million, seven hundred twenty-one thousand, seven hundred twenty-seven".