18320479533 has 16 divisors (see below), whose sum is σ = 27523728000. Its totient is φ = 12041628480.

The previous prime is 18320479519. The next prime is 18320479549. The reversal of 18320479533 is 33597402381.

18320479533 is a `hidden beast` number, since 18 + 32 + 0 + 4 + 79 + 533 = 666.

It is not a de Polignac number, because 18320479533 - 2⁸ = 18320479277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18320479553) 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, 4776508 + ... + 4780341.

It is an arithmetic number, because the mean of its divisors is an integer number (1720233000).

Almost surely, 2^18320479533 is an apocalyptic number.

It is an amenable number.

18320479533 is a deficient number, since it is larger than the sum of its proper divisors (9203248467).

18320479533 is an equidigital number, since it uses as much as digits as its factorization.

18320479533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9556929 (or 9556923 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 18320479533 in words is "eighteen billion, three hundred twenty million, four hundred seventy-nine thousand, five hundred thirty-three".