18161066168 has 64 divisors (see below), whose sum is σ = 39855298560. Its totient is φ = 7595876736.

The previous prime is 18161066159. The next prime is 18161066177. The reversal of 18161066168 is 86166016181.

It is a Cunningham number, because it is equal to 134763²-1.

It is an interprime number because it is at equal distance from previous prime (18161066159) and next prime (18161066177).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3770930 + ... + 3775742.

It is an arithmetic number, because the mean of its divisors is an integer number (622739040).

Almost surely, 2^18161066168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18161066168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19927649280).

18161066168 is an abundant number, since it is smaller than the sum of its proper divisors (21694232392).

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

18161066168 is a wasteful number, since it uses less digits than its factorization.

18161066168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6436 (or 6432 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 18161066168 in words is "eighteen billion, one hundred sixty-one million, sixty-six thousand, one hundred sixty-eight".