19772345017 has 2 divisors, whose sum is σ = 19772345018. Its totient is φ = 19772345016.

The previous prime is 19772344957. The next prime is 19772345027. The reversal of 19772345017 is 71054327791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18819449856 + 952895161 = 137184^2 + 30869^2 .

It is an emirp because it is prime and its reverse (71054327791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19772345017 - 2¹⁹ = 19771820729 is a prime.

It is not a weakly prime, because it can be changed into another prime (19772345027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886172508 + 9886172509.

It is an arithmetic number, because the mean of its divisors is an integer number (9886172509).

Almost surely, 2^19772345017 is an apocalyptic number.

It is an amenable number.

19772345017 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772345017 is an equidigital number, since it uses as much as digits as its factorization.

19772345017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 19772345017 in words is "nineteen billion, seven hundred seventy-two million, three hundred forty-five thousand, seventeen".