18783430523 has 24 divisors (see below), whose sum is σ = 22264142544. Its totient is φ = 15741253440.

The previous prime is 18783430517. The next prime is 18783430553. The reversal of 18783430523 is 32503438781.

It is not a de Polignac number, because 18783430523 - 2¹⁸ = 18783168379 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18783430513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1230365 + ... + 1245537.

It is an arithmetic number, because the mean of its divisors is an integer number (927672606).

Almost surely, 2^18783430523 is an apocalyptic number.

18783430523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18783430523 is a deficient number, since it is larger than the sum of its proper divisors (3480712021).

18783430523 is a wasteful number, since it uses less digits than its factorization.

18783430523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15995 (or 15984 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 18783430523 in words is "eighteen billion, seven hundred eighty-three million, four hundred thirty thousand, five hundred twenty-three".