79621501717 has 2 divisors, whose sum is σ = 79621501718. Its totient is φ = 79621501716.

The previous prime is 79621501697. The next prime is 79621501721. The reversal of 79621501717 is 71710512697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65147968081 + 14473533636 = 255241^2 + 120306^2 .

It is an emirp because it is prime and its reverse (71710512697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79621501717 - 2²⁷ = 79487283989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79621501747) 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, 39810750858 + 39810750859.

It is an arithmetic number, because the mean of its divisors is an integer number (39810750859).

Almost surely, 2^79621501717 is an apocalyptic number.

It is an amenable number.

79621501717 is a deficient number, since it is larger than the sum of its proper divisors (1).

79621501717 is an equidigital number, since it uses as much as digits as its factorization.

79621501717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 46.

The spelling of 79621501717 in words is "seventy-nine billion, six hundred twenty-one million, five hundred one thousand, seven hundred seventeen".