18518516683351 has 4 divisors (see below), whose sum is σ = 18653688338112. Its totient is φ = 18383345028592.

The previous prime is 18518516683309. The next prime is 18518516683399. The reversal of 18518516683351 is 15338661581581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18518516683351 - 2²³ = 18518508294743 is a prime.

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 18518516683351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518516680351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67585827175 + ... + 67585827448.

It is an arithmetic number, because the mean of its divisors is an integer number (4663422084528).

Almost surely, 2^{18518516683351} is an apocalyptic number.

18518516683351 is a deficient number, since it is larger than the sum of its proper divisors (135171654761).

18518516683351 is a wasteful number, since it uses less digits than its factorization.

18518516683351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135171654760.

The product of its digits is 20736000, while the sum is 61.

The spelling of 18518516683351 in words is "eighteen trillion, five hundred eighteen billion, five hundred sixteen million, six hundred eighty-three thousand, three hundred fifty-one".