19008785809 has 16 divisors (see below), whose sum is σ = 22243540480. Its totient is φ = 16086833280.

The previous prime is 19008785801. The next prime is 19008785813. The reversal of 19008785809 is 90858780091.

It is a cyclic number.

It is not a de Polignac number, because 19008785809 - 2³ = 19008785801 is a prime.

It is a super-2 number, since 2×19008785809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19008785809.

It is not an unprimeable number, because it can be changed into a prime (19008785801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1233612 + ... + 1248925.

It is an arithmetic number, because the mean of its divisors is an integer number (1390221280).

Almost surely, 2^19008785809 is an apocalyptic number.

19008785809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19008785809 is a deficient number, since it is larger than the sum of its proper divisors (3234754671).

19008785809 is a wasteful number, since it uses less digits than its factorization.

19008785809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482600.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The spelling of 19008785809 in words is "nineteen billion, eight million, seven hundred eighty-five thousand, eight hundred nine".