11651111115666 has 64 divisors (see below), whose sum is σ = 26216887818240. Its totient is φ = 3420843572160.

The previous prime is 11651111115607. The next prime is 11651111115673. The reversal of 11651111115666 is 66651111115611.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9397816 + ... + 10565091.

It is an arithmetic number, because the mean of its divisors is an integer number (409638872160).

Almost surely, 2^{11651111115666} is an apocalyptic number.

11651111115666 is an abundant number, since it is smaller than the sum of its proper divisors (14565776702574).

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

11651111115666 is a wasteful number, since it uses less digits than its factorization.

11651111115666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19963199.

The product of its digits is 32400, while the sum is 42.

Subtracting 11651111115666 from its reverse (66651111115611), we obtain a palindrome (54999999999945).

The spelling of 11651111115666 in words is "eleven trillion, six hundred fifty-one billion, one hundred eleven million, one hundred fifteen thousand, six hundred sixty-six".