19380612557 has 2 divisors, whose sum is σ = 19380612558. Its totient is φ = 19380612556.

The previous prime is 19380612497. The next prime is 19380612577. The reversal of 19380612557 is 75521608391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16553138281 + 2827474276 = 128659^2 + 53174^2 .

It is an emirp because it is prime and its reverse (75521608391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19380612557 - 2¹⁰ = 19380611533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19380612577) 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, 9690306278 + 9690306279.

It is an arithmetic number, because the mean of its divisors is an integer number (9690306279).

Almost surely, 2^19380612557 is an apocalyptic number.

It is an amenable number.

19380612557 is a deficient number, since it is larger than the sum of its proper divisors (1).

19380612557 is an equidigital number, since it uses as much as digits as its factorization.

19380612557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 19380612557 in words is "nineteen billion, three hundred eighty million, six hundred twelve thousand, five hundred fifty-seven".