18997366413903 has 4 divisors (see below), whose sum is σ = 25329821885208. Its totient is φ = 12664910942600.

The previous prime is 18997366413853. The next prime is 18997366413953. The reversal of 18997366413903 is 30931466379981.

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

It is an interprime number because it is at equal distance from previous prime (18997366413853) and next prime (18997366413953).

It is a cyclic number.

It is not a de Polignac number, because 18997366413903 - 2⁹ = 18997366413391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997366413953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3166227735648 + ... + 3166227735653.

It is an arithmetic number, because the mean of its divisors is an integer number (6332455471302).

Almost surely, 2^{18997366413903} is an apocalyptic number.

18997366413903 is a deficient number, since it is larger than the sum of its proper divisors (6332455471305).

18997366413903 is an equidigital number, since it uses as much as digits as its factorization.

18997366413903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332455471304.

The product of its (nonzero) digits is 158723712, while the sum is 69.

The spelling of 18997366413903 in words is "eighteen trillion, nine hundred ninety-seven billion, three hundred sixty-six million, four hundred thirteen thousand, nine hundred three".