79422315977 has 2 divisors, whose sum is σ = 79422315978. Its totient is φ = 79422315976.

The previous prime is 79422315971. The next prime is 79422316003. The reversal of 79422315977 is 77951322497.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79286733241 + 135582736 = 281579^2 + 11644^2 .

It is an emirp because it is prime and its reverse (77951322497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79422315977 - 2⁶ = 79422315913 is a prime.

It is not a weakly prime, because it can be changed into another prime (79422315971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39711157988 + 39711157989.

It is an arithmetic number, because the mean of its divisors is an integer number (39711157989).

Almost surely, 2^79422315977 is an apocalyptic number.

It is an amenable number.

79422315977 is a deficient number, since it is larger than the sum of its proper divisors (1).

79422315977 is an equidigital number, since it uses as much as digits as its factorization.

79422315977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 56.

The spelling of 79422315977 in words is "seventy-nine billion, four hundred twenty-two million, three hundred fifteen thousand, nine hundred seventy-seven".