19859515223 has 2 divisors, whose sum is σ = 19859515224. Its totient is φ = 19859515222.

The previous prime is 19859515199. The next prime is 19859515229. The reversal of 19859515223 is 32251595891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19859515223 - 2¹² = 19859511127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19859515229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9929757611 + 9929757612.

It is an arithmetic number, because the mean of its divisors is an integer number (9929757612).

Almost surely, 2^19859515223 is an apocalyptic number.

19859515223 is a deficient number, since it is larger than the sum of its proper divisors (1).

19859515223 is an equidigital number, since it uses as much as digits as its factorization.

19859515223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 50.

The spelling of 19859515223 in words is "nineteen billion, eight hundred fifty-nine million, five hundred fifteen thousand, two hundred twenty-three".