18783524809 has 15 divisors (see below), whose sum is σ = 21920645607. Its totient is φ = 16094407896.

The previous prime is 18783524789. The next prime is 18783524813. The reversal of 18783524809 is 90842538781.

The square root of 18783524809 is 137053.

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

It can be written as a sum of positive squares in only one way, i.e., 13887444025 + 4896080784 = 117845^2 + 69972^2 .

It is not a de Polignac number, because 18783524809 - 2¹¹ = 18783522761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18783524809.

It is not an unprimeable number, because it can be changed into a prime (18783524909) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6714199 + ... + 6716995.

Almost surely, 2^18783524809 is an apocalyptic number.

18783524809 is the 137053-rd square number.

18783524809 is the 68527-th centered octagonal number.

It is an amenable number.

18783524809 is a deficient number, since it is larger than the sum of its proper divisors (3137120798).

18783524809 is an frugal number, since it uses more digits than its factorization.

18783524809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622 (or 2804 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 18783524809 in words is "eighteen billion, seven hundred eighty-three million, five hundred twenty-four thousand, eight hundred nine".