78769721113 has 2 divisors, whose sum is σ = 78769721114. Its totient is φ = 78769721112.

The previous prime is 78769721101. The next prime is 78769721137. The reversal of 78769721113 is 31112796787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55654471744 + 23115249369 = 235912^2 + 152037^2 .

It is a cyclic number.

It is not a de Polignac number, because 78769721113 - 2⁵ = 78769721081 is a prime.

It is not a weakly prime, because it can be changed into another prime (78769721213) 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 as a sum of consecutive naturals, namely, 39384860556 + 39384860557.

It is an arithmetic number, because the mean of its divisors is an integer number (39384860557).

Almost surely, 2^78769721113 is an apocalyptic number.

It is an amenable number.

78769721113 is a deficient number, since it is larger than the sum of its proper divisors (1).

78769721113 is an equidigital number, since it uses as much as digits as its factorization.

78769721113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 52.

The spelling of 78769721113 in words is "seventy-eight billion, seven hundred sixty-nine million, seven hundred twenty-one thousand, one hundred thirteen".