19718324807 has 4 divisors (see below), whose sum is σ = 19719581856. Its totient is φ = 19717067760.

The previous prime is 19718324777. The next prime is 19718324881. The reversal of 19718324807 is 70842381791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70842381791 = 229 ⋅309355379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19718324807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19718324107) 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 in 3 ways as a sum of consecutive naturals, for example, 604694 + ... + 636467.

It is an arithmetic number, because the mean of its divisors is an integer number (4929895464).

Almost surely, 2^19718324807 is an apocalyptic number.

19718324807 is a deficient number, since it is larger than the sum of its proper divisors (1257049).

19718324807 is a wasteful number, since it uses less digits than its factorization.

19718324807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257048.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 19718324807 in words is "nineteen billion, seven hundred eighteen million, three hundred twenty-four thousand, eight hundred seven".