156221261161 has 8 divisors (see below), whose sum is σ = 178701344640. Its totient is φ = 133781867808.

The previous prime is 156221261153. The next prime is 156221261171. The reversal of 156221261161 is 161162122651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 156221261161 - 2³ = 156221261153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156221261171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10164301 + ... + 10179658.

It is an arithmetic number, because the mean of its divisors is an integer number (22337668080).

Almost surely, 2^156221261161 is an apocalyptic number.

It is an amenable number.

156221261161 is a deficient number, since it is larger than the sum of its proper divisors (22480083479).

156221261161 is a wasteful number, since it uses less digits than its factorization.

156221261161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20345063.

The product of its digits is 8640, while the sum is 34.

The spelling of 156221261161 in words is "one hundred fifty-six billion, two hundred twenty-one million, two hundred sixty-one thousand, one hundred sixty-one".