155566161 has 12 divisors (see below), whose sum is σ = 228061392. Its totient is φ = 102162456.

The previous prime is 155566141. The next prime is 155566171. The reversal of 155566161 is 161665551.

It is not a de Polignac number, because 155566161 - 2⁶ = 155566097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155566141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128391 + ... + 129596.

It is an arithmetic number, because the mean of its divisors is an integer number (19005116).

Almost surely, 2^155566161 is an apocalyptic number.

It is an amenable number.

155566161 is a deficient number, since it is larger than the sum of its proper divisors (72495231).

155566161 is a wasteful number, since it uses less digits than its factorization.

155566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258060 (or 258057 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 155566161 is about 12472.6164456380. The cubic root of 155566161 is about 537.8217706313.

The spelling of 155566161 in words is "one hundred fifty-five million, five hundred sixty-six thousand, one hundred sixty-one".