79942577173 has 2 divisors, whose sum is σ = 79942577174. Its totient is φ = 79942577172.

The previous prime is 79942577171. The next prime is 79942577219. The reversal of 79942577173 is 37177524997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77229521604 + 2713055569 = 277902^2 + 52087^2 .

It is a cyclic number.

It is not a de Polignac number, because 79942577173 - 2¹ = 79942577171 is a prime.

It is a super-2 number, since 2×79942577173² (a number of 23 digits) contains 22 as substring.

Together with 79942577171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79942577171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39971288586 + 39971288587.

It is an arithmetic number, because the mean of its divisors is an integer number (39971288587).

Almost surely, 2^79942577173 is an apocalyptic number.

It is an amenable number.

79942577173 is a deficient number, since it is larger than the sum of its proper divisors (1).

79942577173 is an equidigital number, since it uses as much as digits as its factorization.

79942577173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23337720, while the sum is 61.

The spelling of 79942577173 in words is "seventy-nine billion, nine hundred forty-two million, five hundred seventy-seven thousand, one hundred seventy-three".