666105611500 has 96 divisors (see below), whose sum is σ = 1671786829440. Its totient is φ = 227117088000.

The previous prime is 666105611477. The next prime is 666105611513. The reversal of 666105611500 is 5116501666.

It is a self number, because there is not a number n which added to its sum of digits gives 666105611500.

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, 107766 + ... + 1159234.

It is an arithmetic number, because the mean of its divisors is an integer number (17414446140).

Almost surely, 2^666105611500 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 666105611500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835893414720).

666105611500 is an abundant number, since it is smaller than the sum of its proper divisors (1005681217940).

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

666105611500 is a wasteful number, since it uses less digits than its factorization.

666105611500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051676 (or 1051664 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 666105611500 in words is "six hundred sixty-six billion, one hundred five million, six hundred eleven thousand, five hundred".