18166531803036 has 96 divisors (see below), whose sum is σ = 43948863340032. Its totient is φ = 5835954873600.

The previous prime is 18166531802963. The next prime is 18166531803103. The reversal of 18166531803036 is 63030813566181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18166531803036.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22873830 + ... + 23654706.

It is an arithmetic number, because the mean of its divisors is an integer number (457800659792).

Almost surely, 2^{18166531803036} is an apocalyptic number.

It is an amenable number.

18166531803036 is an abundant number, since it is smaller than the sum of its proper divisors (25782331536996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18166531803036 is a wasteful number, since it uses less digits than its factorization.

18166531803036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781419 (or 781417 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 18166531803036 in words is "eighteen trillion, one hundred sixty-six billion, five hundred thirty-one million, eight hundred three thousand, thirty-six".