18361616381 has 8 divisors (see below), whose sum is σ = 19167404544. Its totient is φ = 17556449680.

The previous prime is 18361616369. The next prime is 18361616407.

18361616381 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18361616381 is a prime.

It is a super-2 number, since 2×18361616381² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361616311) 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, 94466 + ... + 213651.

It is an arithmetic number, because the mean of its divisors is an integer number (2395925568).

Almost surely, 2^18361616381 is an apocalyptic number.

It is an amenable number.

18361616381 is a deficient number, since it is larger than the sum of its proper divisors (805788163).

18361616381 is a wasteful number, since it uses less digits than its factorization.

18361616381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310731.

The product of its digits is 124416, while the sum is 44.

The spelling of 18361616381 in words is "eighteen billion, three hundred sixty-one million, six hundred sixteen thousand, three hundred eighty-one".