18481042997 has 4 divisors (see below), whose sum is σ = 18574855596. Its totient is φ = 18387230400.

The previous prime is 18481042991. The next prime is 18481043011. The reversal of 18481042997 is 79924018481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11483051281 + 6997991716 = 107159^2 + 83654^2 .

It is a cyclic number.

It is not a de Polignac number, because 18481042997 - 2⁴ = 18481042981 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 (18481042991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46906004 + ... + 46906397.

It is an arithmetic number, because the mean of its divisors is an integer number (4643713899).

Almost surely, 2^18481042997 is an apocalyptic number.

It is an amenable number.

18481042997 is a deficient number, since it is larger than the sum of its proper divisors (93812599).

18481042997 is an equidigital number, since it uses as much as digits as its factorization.

18481042997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93812598.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The spelling of 18481042997 in words is "eighteen billion, four hundred eighty-one million, forty-two thousand, nine hundred ninety-seven".