18285456549491 has 4 divisors (see below), whose sum is σ = 18285579146352. Its totient is φ = 18285333952632.

The previous prime is 18285456549443. The next prime is 18285456549523. The reversal of 18285456549491 is 19494565458281.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18285456549491 is a prime.

It is a super-3 number, since 3×18285456549491³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18285456549691) 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, 61074431 + ... + 61373096.

It is an arithmetic number, because the mean of its divisors is an integer number (4571394786588).

Almost surely, 2^{18285456549491} is an apocalyptic number.

18285456549491 is a deficient number, since it is larger than the sum of its proper divisors (122596861).

18285456549491 is a wasteful number, since it uses less digits than its factorization.

18285456549491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122596860.

The product of its digits is 497664000, while the sum is 71.

The spelling of 18285456549491 in words is "eighteen trillion, two hundred eighty-five billion, four hundred fifty-six million, five hundred forty-nine thousand, four hundred ninety-one".