19499599787 has 2 divisors, whose sum is σ = 19499599788. Its totient is φ = 19499599786.

The previous prime is 19499599751. The next prime is 19499599789. The reversal of 19499599787 is 78799599491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19499599787 - 2⁸ = 19499599531 is a prime.

Together with 19499599789, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19499599789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749799893 + 9749799894.

It is an arithmetic number, because the mean of its divisors is an integer number (9749799894).

Almost surely, 2^19499599787 is an apocalyptic number.

19499599787 is a deficient number, since it is larger than the sum of its proper divisors (1).

19499599787 is an equidigital number, since it uses as much as digits as its factorization.

19499599787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 462944160, while the sum is 77.

The spelling of 19499599787 in words is "nineteen billion, four hundred ninety-nine million, five hundred ninety-nine thousand, seven hundred eighty-seven".