79811727757 has 2 divisors, whose sum is σ = 79811727758. Its totient is φ = 79811727756.

The previous prime is 79811727733. The next prime is 79811727797. The reversal of 79811727757 is 75772711897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72508487076 + 7303240681 = 269274^2 + 85459^2 .

It is an emirp because it is prime and its reverse (75772711897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79811727757 - 2¹¹ = 79811725709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79811727695 and 79811727704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79811727797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39905863878 + 39905863879.

It is an arithmetic number, because the mean of its divisors is an integer number (39905863879).

Almost surely, 2^79811727757 is an apocalyptic number.

It is an amenable number.

79811727757 is a deficient number, since it is larger than the sum of its proper divisors (1).

79811727757 is an equidigital number, since it uses as much as digits as its factorization.

79811727757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12101040, while the sum is 61.

The spelling of 79811727757 in words is "seventy-nine billion, eight hundred eleven million, seven hundred twenty-seven thousand, seven hundred fifty-seven".