19712693551 has 2 divisors, whose sum is σ = 19712693552. Its totient is φ = 19712693550.

The previous prime is 19712693503. The next prime is 19712693573. The reversal of 19712693551 is 15539621791.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (15539621791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19712693551 - 2¹¹ = 19712691503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19712693495 and 19712693504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19712693051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856346775 + 9856346776.

It is an arithmetic number, because the mean of its divisors is an integer number (9856346776).

Almost surely, 2^19712693551 is an apocalyptic number.

19712693551 is a deficient number, since it is larger than the sum of its proper divisors (1).

19712693551 is an equidigital number, since it uses as much as digits as its factorization.

19712693551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510300, while the sum is 49.

The spelling of 19712693551 in words is "nineteen billion, seven hundred twelve million, six hundred ninety-three thousand, five hundred fifty-one".