18081540403 has 4 divisors (see below), whose sum is σ = 18082154448. Its totient is φ = 18080926360.

The previous prime is 18081540383. The next prime is 18081540481. The reversal of 18081540403 is 30404518081.

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

It is a cyclic number.

It is not a de Polignac number, because 18081540403 - 2⁵ = 18081540371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18081240403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260503 + ... + 322528.

It is an arithmetic number, because the mean of its divisors is an integer number (4520538612).

Almost surely, 2^18081540403 is an apocalyptic number.

18081540403 is a deficient number, since it is larger than the sum of its proper divisors (614045).

18081540403 is an equidigital number, since it uses as much as digits as its factorization.

18081540403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614044.

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 18081540403 in words is "eighteen billion, eighty-one million, five hundred forty thousand, four hundred three".