18543197642 has 8 divisors (see below), whose sum is σ = 28101547236. Its totient is φ = 9176015232.

The previous prime is 18543197597. The next prime is 18543197663. The reversal of 18543197642 is 24679134581.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18539273281 + 3924361 = 136159^2 + 1981^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47791553 + ... + 47791940.

Almost surely, 2^18543197642 is an apocalyptic number.

18543197642 is a deficient number, since it is larger than the sum of its proper divisors (9558349594).

18543197642 is an equidigital number, since it uses as much as digits as its factorization.

18543197642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95583592.

The product of its digits is 1451520, while the sum is 50.

The spelling of 18543197642 in words is "eighteen billion, five hundred forty-three million, one hundred ninety-seven thousand, six hundred forty-two".