19375804809 has 9 divisors (see below), whose sum is σ = 27987876813. Its totient is φ = 12916924812.

The previous prime is 19375804801. The next prime is 19375804823. The reversal of 19375804809 is 90840857391.

The square root of 19375804809 is 139197.

It is a perfect power (a square), and thus also a powerful number.

19375804809 is a `hidden beast` number, since 1 + 93 + 75 + 8 + 0 + 480 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 19375804809 - 2³ = 19375804801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19375804801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 394392 + ... + 440790.

Almost surely, 2^19375804809 is an apocalyptic number.

19375804809 is the 139197-th square number.

19375804809 is the 69599-th centered octagonal number.

It is an amenable number.

19375804809 is a deficient number, since it is larger than the sum of its proper divisors (8612072004).

19375804809 is an frugal number, since it uses more digits than its factorization.

19375804809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92804 (or 46402 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 19375804809 in words is "nineteen billion, three hundred seventy-five million, eight hundred four thousand, eight hundred nine".