79727648261 has 2 divisors, whose sum is σ = 79727648262. Its totient is φ = 79727648260.

The previous prime is 79727648153. The next prime is 79727648327. The reversal of 79727648261 is 16284672797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79442241025 + 285407236 = 281855^2 + 16894^2 .

It is a cyclic number.

It is not a de Polignac number, because 79727648261 - 2¹⁴ = 79727631877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79727648261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79727647261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39863824130 + 39863824131.

It is an arithmetic number, because the mean of its divisors is an integer number (39863824131).

Almost surely, 2^79727648261 is an apocalyptic number.

It is an amenable number.

79727648261 is a deficient number, since it is larger than the sum of its proper divisors (1).

79727648261 is an equidigital number, since it uses as much as digits as its factorization.

79727648261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 59.

The spelling of 79727648261 in words is "seventy-nine billion, seven hundred twenty-seven million, six hundred forty-eight thousand, two hundred sixty-one".