18231532705 has 24 divisors (see below), whose sum is σ = 23160170880. Its totient is φ = 13774332000.

The previous prime is 18231532663. The next prime is 18231532763. The reversal of 18231532705 is 50723513281.

It is not a de Polignac number, because 18231532705 - 2¹³ = 18231524513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165330 + ... + 252580.

It is an arithmetic number, because the mean of its divisors is an integer number (965007120).

Almost surely, 2^18231532705 is an apocalyptic number.

It is an amenable number.

18231532705 is a deficient number, since it is larger than the sum of its proper divisors (4928638175).

18231532705 is an equidigital number, since it uses as much as digits as its factorization.

18231532705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87381 (or 87358 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 18231532705 in words is "eighteen billion, two hundred thirty-one million, five hundred thirty-two thousand, seven hundred five".