18540818498 has 4 divisors (see below), whose sum is σ = 27811227750. Its totient is φ = 9270409248.

The previous prime is 18540818497. The next prime is 18540818503. The reversal of 18540818498 is 89481804581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18537639409 + 3179089 = 136153^2 + 1783^2 .

It is not an unprimeable number, because it can be changed into a prime (18540818497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4635204623 + ... + 4635204626.

Almost surely, 2^18540818498 is an apocalyptic number.

18540818498 is a deficient number, since it is larger than the sum of its proper divisors (9270409252).

18540818498 is an equidigital number, since it uses as much as digits as its factorization.

18540818498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9270409251.

The product of its (nonzero) digits is 2949120, while the sum is 56.

The spelling of 18540818498 in words is "eighteen billion, five hundred forty million, eight hundred eighteen thousand, four hundred ninety-eight".