11505651666 has 32 divisors (see below), whose sum is σ = 24257644800. Its totient is φ = 3628080720.

The previous prime is 11505651659. The next prime is 11505651667. The reversal of 11505651666 is 66615650511.

It is not an unprimeable number, because it can be changed into a prime (11505651667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5745 + ... + 151803.

It is an arithmetic number, because the mean of its divisors is an integer number (758051400).

Almost surely, 2^11505651666 is an apocalyptic number.

11505651666 is an abundant number, since it is smaller than the sum of its proper divisors (12751993134).

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

11505651666 is a wasteful number, since it uses less digits than its factorization.

11505651666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146774.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 11505651666 in words is "eleven billion, five hundred five million, six hundred fifty-one thousand, six hundred sixty-six".