18489217261 has 8 divisors (see below), whose sum is σ = 18697889664. Its totient is φ = 18281209440.

The previous prime is 18489217259. The next prime is 18489217273. The reversal of 18489217261 is 16271298481.

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 18489217261 - 2¹ = 18489217259 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 (18489217291) 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, 110085 + ... + 221578.

It is an arithmetic number, because the mean of its divisors is an integer number (2337236208).

Almost surely, 2^18489217261 is an apocalyptic number.

It is an amenable number.

18489217261 is a deficient number, since it is larger than the sum of its proper divisors (208672403).

18489217261 is a wasteful number, since it uses less digits than its factorization.

18489217261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332291.

The product of its digits is 387072, while the sum is 49.

The spelling of 18489217261 in words is "eighteen billion, four hundred eighty-nine million, two hundred seventeen thousand, two hundred sixty-one".