11661161651166 has 64 divisors (see below), whose sum is σ = 24518280729600. Its totient is φ = 3692416081536.

The previous prime is 11661161651149. The next prime is 11661161651203. The reversal of 11661161651166 is 66115616116611.

It is a congruent number.

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, 2391300 + ... + 5388936.

It is an arithmetic number, because the mean of its divisors is an integer number (383098136400).

Almost surely, 2^{11661161651166} is an apocalyptic number.

11661161651166 is an abundant number, since it is smaller than the sum of its proper divisors (12857119078434).

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

11661161651166 is a wasteful number, since it uses less digits than its factorization.

11661161651166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998033.

The product of its digits is 233280, while the sum is 48.

Adding to 11661161651166 its reverse (66115616116611), we get a palindrome (77776777767777).

The spelling of 11661161651166 in words is "eleven trillion, six hundred sixty-one billion, one hundred sixty-one million, six hundred fifty-one thousand, one hundred sixty-six".