79677971773 has 2 divisors, whose sum is σ = 79677971774. Its totient is φ = 79677971772.

The previous prime is 79677971761. The next prime is 79677971777. The reversal of 79677971773 is 37717977697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79525128004 + 152843769 = 282002^2 + 12363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79677971773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79677971777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39838985886 + 39838985887.

It is an arithmetic number, because the mean of its divisors is an integer number (39838985887).

Almost surely, 2^79677971773 is an apocalyptic number.

It is an amenable number.

79677971773 is a deficient number, since it is larger than the sum of its proper divisors (1).

79677971773 is an equidigital number, since it uses as much as digits as its factorization.

79677971773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171532242, while the sum is 70.

The spelling of 79677971773 in words is "seventy-nine billion, six hundred seventy-seven million, nine hundred seventy-one thousand, seven hundred seventy-three".