19783266409 has 9 divisors (see below), whose sum is σ = 20260235709. Its totient is φ = 19317283020.

The previous prime is 19783266407. The next prime is 19783266439. The reversal of 19783266409 is 90466238791.

The square root of 19783266409 is 140653.

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

It is not a de Polignac number, because 19783266409 - 2¹ = 19783266407 is a prime.

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 19783266409.

It is not an unprimeable number, because it can be changed into a prime (19783266407) 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, 6046444 + ... + 6049714.

It is an arithmetic number, because the mean of its divisors is an integer number (2251137301).

Almost surely, 2^19783266409 is an apocalyptic number.

19783266409 is the 140653-rd square number.

19783266409 is the 70327-th centered octagonal number.

It is an amenable number.

19783266409 is a deficient number, since it is larger than the sum of its proper divisors (476969300).

19783266409 is an frugal number, since it uses more digits than its factorization.

19783266409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628 (or 3314 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 19783266409 in words is "nineteen billion, seven hundred eighty-three million, two hundred sixty-six thousand, four hundred nine".