79818522517 has 2 divisors, whose sum is σ = 79818522518. Its totient is φ = 79818522516.

The previous prime is 79818522449. The next prime is 79818522523. The reversal of 79818522517 is 71522581897.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44386483761 + 35432038756 = 210681^2 + 188234^2 .

It is a cyclic number.

It is not a de Polignac number, because 79818522517 - 2¹¹ = 79818520469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79818522557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39909261258 + 39909261259.

It is an arithmetic number, because the mean of its divisors is an integer number (39909261259).

Almost surely, 2^79818522517 is an apocalyptic number.

It is an amenable number.

79818522517 is a deficient number, since it is larger than the sum of its proper divisors (1).

79818522517 is an equidigital number, since it uses as much as digits as its factorization.

79818522517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 55.

The spelling of 79818522517 in words is "seventy-nine billion, eight hundred eighteen million, five hundred twenty-two thousand, five hundred seventeen".