79652643977 has 2 divisors, whose sum is σ = 79652643978. Its totient is φ = 79652643976.

The previous prime is 79652643949. The next prime is 79652643997. The reversal of 79652643977 is 77934625697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56348789641 + 23303854336 = 237379^2 + 152656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79652643977 is a prime.

It is not a weakly prime, because it can be changed into another prime (79652643997) 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, 39826321988 + 39826321989.

It is an arithmetic number, because the mean of its divisors is an integer number (39826321989).

Almost surely, 2^79652643977 is an apocalyptic number.

It is an amenable number.

79652643977 is a deficient number, since it is larger than the sum of its proper divisors (1).

79652643977 is an equidigital number, since it uses as much as digits as its factorization.

79652643977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120022560, while the sum is 65.

The spelling of 79652643977 in words is "seventy-nine billion, six hundred fifty-two million, six hundred forty-three thousand, nine hundred seventy-seven".