18124380181 has 8 divisors (see below), whose sum is σ = 18615913784. Its totient is φ = 17632935360.

The previous prime is 18124380143. The next prime is 18124380191. The reversal of 18124380181 is 18108342181.

It can be written as a sum of positive squares in 4 ways, for example, as 8786250225 + 9338129956 = 93735^2 + 96634^2 .

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 18124380181 - 2¹⁷ = 18124249109 is a prime.

It is a super-2 number, since 2×18124380181² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18124380181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18124380101) 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, 756811 + ... + 780391.

It is an arithmetic number, because the mean of its divisors is an integer number (2326989223).

Almost surely, 2^18124380181 is an apocalyptic number.

It is an amenable number.

18124380181 is a deficient number, since it is larger than the sum of its proper divisors (491533603).

18124380181 is a wasteful number, since it uses less digits than its factorization.

18124380181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44391.

The product of its (nonzero) digits is 12288, while the sum is 37.

The spelling of 18124380181 in words is "eighteen billion, one hundred twenty-four million, three hundred eighty thousand, one hundred eighty-one".