18500018516834 has 8 divisors (see below), whose sum is σ = 27844737768540. Its totient is φ = 9218439260656.

The previous prime is 18500018516821. The next prime is 18500018516923. The reversal of 18500018516834 is 43861581000581.

It can be written as a sum of positive squares in 2 ways, for example, as 17790806947225 + 709211569609 = 4217915^2 + 842147^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15784998149 + ... + 15784999320.

Almost surely, 2^{18500018516834} is an apocalyptic number.

18500018516834 is a deficient number, since it is larger than the sum of its proper divisors (9344719251706).

18500018516834 is a wasteful number, since it uses less digits than its factorization.

18500018516834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31569997764.

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 18500018516834 in words is "eighteen trillion, five hundred billion, eighteen million, five hundred sixteen thousand, eight hundred thirty-four".