11661011166 has 16 divisors (see below), whose sum is σ = 26653739904. Its totient is φ = 3331717464.

The previous prime is 11661011149. The next prime is 11661011207. The reversal of 11661011166 is 66111016611.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 138821520 + ... + 138821603.

It is an arithmetic number, because the mean of its divisors is an integer number (1665858744).

Almost surely, 2^11661011166 is an apocalyptic number.

11661011166 is an abundant number, since it is smaller than the sum of its proper divisors (14992728738).

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

11661011166 is a wasteful number, since it uses less digits than its factorization.

11661011166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277643135.

The product of its (nonzero) digits is 1296, while the sum is 30.

Adding to 11661011166 its reverse (66111016611), we get a palindrome (77772027777).

Subtracting 11661011166 from its reverse (66111016611), we obtain a palindrome (54450005445).

The spelling of 11661011166 in words is "eleven billion, six hundred sixty-one million, eleven thousand, one hundred sixty-six".