19523040517 has 2 divisors, whose sum is σ = 19523040518. Its totient is φ = 19523040516.

The previous prime is 19523040473. The next prime is 19523040521. The reversal of 19523040517 is 71504032591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14876436961 + 4646603556 = 121969^2 + 68166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19523040517 is a prime.

It is a super-2 number, since 2×19523040517² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19523040217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9761520258 + 9761520259.

It is an arithmetic number, because the mean of its divisors is an integer number (9761520259).

Almost surely, 2^19523040517 is an apocalyptic number.

It is an amenable number.

19523040517 is a deficient number, since it is larger than the sum of its proper divisors (1).

19523040517 is an equidigital number, since it uses as much as digits as its factorization.

19523040517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 19523040517 in words is "nineteen billion, five hundred twenty-three million, forty thousand, five hundred seventeen".