18466887549 has 8 divisors (see below), whose sum is σ = 26860927392. Its totient is φ = 11192053040.

The previous prime is 18466887539. The next prime is 18466887587. The reversal of 18466887549 is 94578866481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18466887549 - 2²³ = 18458498941 is a prime.

It is a super-2 number, since 2×18466887549² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18466887549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18466887539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279801294 + ... + 279801359.

It is an arithmetic number, because the mean of its divisors is an integer number (3357615924).

Almost surely, 2^18466887549 is an apocalyptic number.

It is an amenable number.

18466887549 is a deficient number, since it is larger than the sum of its proper divisors (8394039843).

18466887549 is a wasteful number, since it uses less digits than its factorization.

18466887549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559602667.

The product of its digits is 92897280, while the sum is 66.

The spelling of 18466887549 in words is "eighteen billion, four hundred sixty-six million, eight hundred eighty-seven thousand, five hundred forty-nine".