18530918399 has 8 divisors (see below), whose sum is σ = 21180425760. Its totient is φ = 15881969376.

The previous prime is 18530918383. The next prime is 18530918401. The reversal of 18530918399 is 99381903581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18530918399 - 2⁴ = 18530918383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18530918359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65864 + ... + 203469.

It is an arithmetic number, because the mean of its divisors is an integer number (2647553220).

Almost surely, 2^18530918399 is an apocalyptic number.

18530918399 is a deficient number, since it is larger than the sum of its proper divisors (2649507361).

18530918399 is an equidigital number, since it uses as much as digits as its factorization.

18530918399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279169.

The product of its (nonzero) digits is 2099520, while the sum is 56.

The spelling of 18530918399 in words is "eighteen billion, five hundred thirty million, nine hundred eighteen thousand, three hundred ninety-nine".