19790715517 has 2 divisors, whose sum is σ = 19790715518. Its totient is φ = 19790715516.

The previous prime is 19790715509. The next prime is 19790715521. The reversal of 19790715517 is 71551709791.

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., 16105132836 + 3685582681 = 126906^2 + 60709^2 .

It is a cyclic number.

It is not a de Polignac number, because 19790715517 - 2³ = 19790715509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19790715587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9895357758 + 9895357759.

It is an arithmetic number, because the mean of its divisors is an integer number (9895357759).

Almost surely, 2^19790715517 is an apocalyptic number.

It is an amenable number.

19790715517 is a deficient number, since it is larger than the sum of its proper divisors (1).

19790715517 is an equidigital number, since it uses as much as digits as its factorization.

19790715517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 694575, while the sum is 52.

The spelling of 19790715517 in words is "nineteen billion, seven hundred ninety million, seven hundred fifteen thousand, five hundred seventeen".