18161505518 has 16 divisors (see below), whose sum is σ = 31063571280. Its totient is φ = 7889160576.

The previous prime is 18161505449. The next prime is 18161505529. The reversal of 18161505518 is 81550516181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20544248 + ... + 20545131.

It is an arithmetic number, because the mean of its divisors is an integer number (1941473205).

Almost surely, 2^18161505518 is an apocalyptic number.

18161505518 is a deficient number, since it is larger than the sum of its proper divisors (12902065762).

18161505518 is a wasteful number, since it uses less digits than its factorization.

18161505518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41089411.

The product of its (nonzero) digits is 48000, while the sum is 41.

The spelling of 18161505518 in words is "eighteen billion, one hundred sixty-one million, five hundred five thousand, five hundred eighteen".