18618043787471 has 8 divisors (see below), whose sum is σ = 18689187797280. Its totient is φ = 18546902452192.

The previous prime is 18618043787467. The next prime is 18618043787621. The reversal of 18618043787471 is 17478734081681.

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 18618043787471 - 2² = 18618043787467 is a prime.

It is a super-3 number, since 3×18618043787471³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18618043787398 and 18618043787407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618043787171) 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, 13884341 + ... + 15166113.

It is an arithmetic number, because the mean of its divisors is an integer number (2336148474660).

Almost surely, 2^{18618043787471} is an apocalyptic number.

18618043787471 is a deficient number, since it is larger than the sum of its proper divisors (71144009809).

18618043787471 is a wasteful number, since it uses less digits than its factorization.

18618043787471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337265.

The product of its (nonzero) digits is 50577408, while the sum is 65.

The spelling of 18618043787471 in words is "eighteen trillion, six hundred eighteen billion, forty-three million, seven hundred eighty-seven thousand, four hundred seventy-one".