11505515166 has 24 divisors (see below), whose sum is σ = 24974716104. Its totient is φ = 3828079440.

The previous prime is 11505515143. The next prime is 11505515167. The reversal of 11505515166 is 66151550511.

It is a happy number.

11505515166 is a `hidden beast` number, since 1 + 1 + 50 + 551 + 51 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 11505515166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505515167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 581016 + ... + 600491.

It is an arithmetic number, because the mean of its divisors is an integer number (1040613171).

Almost surely, 2^11505515166 is an apocalyptic number.

11505515166 is an abundant number, since it is smaller than the sum of its proper divisors (13469200938).

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

11505515166 is a wasteful number, since it uses less digits than its factorization.

11505515166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182056 (or 1182053 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 11505515166 in words is "eleven billion, five hundred five million, five hundred fifteen thousand, one hundred sixty-six".