18003760866 has 128 divisors (see below), whose sum is σ = 49354959360. Its totient is φ = 4737263616.

The previous prime is 18003760861. The next prime is 18003760871. The reversal of 18003760866 is 66806730081.

18003760866 is a `hidden beast` number, since 1 + 8 + 0 + 0 + 37 + 608 + 6 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (18003760861) and next prime (18003760871).

It is a super-2 number, since 2×18003760866² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18003760861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2241690 + ... + 2249706.

It is an arithmetic number, because the mean of its divisors is an integer number (385585620).

Almost surely, 2^18003760866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18003760866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24677479680).

18003760866 is an abundant number, since it is smaller than the sum of its proper divisors (31351198494).

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

18003760866 is a wasteful number, since it uses less digits than its factorization.

18003760866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8505 (or 8499 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 18003760866 in words is "eighteen billion, three million, seven hundred sixty thousand, eight hundred sixty-six".