18154365881 has 8 divisors (see below), whose sum is σ = 18279422280. Its totient is φ = 18029736448.

The previous prime is 18154365877. The next prime is 18154365899. The reversal of 18154365881 is 18856345181.

It can be written as a sum of positive squares in 4 ways, for example, as 128618281 + 18025747600 = 11341^2 + 134260^2 .

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 18154365881 - 2² = 18154365877 is a prime.

It is a super-2 number, since 2×18154365881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18154365811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21176 + ... + 191721.

It is an arithmetic number, because the mean of its divisors is an integer number (2284927785).

Almost surely, 2^18154365881 is an apocalyptic number.

It is an amenable number.

18154365881 is a deficient number, since it is larger than the sum of its proper divisors (125056399).

18154365881 is a wasteful number, since it uses less digits than its factorization.

18154365881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213483.

The product of its digits is 921600, while the sum is 50.

The spelling of 18154365881 in words is "eighteen billion, one hundred fifty-four million, three hundred sixty-five thousand, eight hundred eighty-one".