156221261166 has 16 divisors (see below), whose sum is σ = 312488679888. Its totient is φ = 52066060800.

The previous prime is 156221261153. The next prime is 156221261171. The reversal of 156221261166 is 661162122651.

156221261166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1879155 + ... + 1960526.

It is an arithmetic number, because the mean of its divisors is an integer number (19530542493).

Almost surely, 2^156221261166 is an apocalyptic number.

156221261166 is an abundant number, since it is smaller than the sum of its proper divisors (156267418722).

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

156221261166 is a wasteful number, since it uses less digits than its factorization.

156221261166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846467.

The product of its digits is 51840, while the sum is 39.

The spelling of 156221261166 in words is "one hundred fifty-six billion, two hundred twenty-one million, two hundred sixty-one thousand, one hundred sixty-six".