55166161 has 4 divisors (see below), whose sum is σ = 55427824. Its totient is φ = 54904500.

The previous prime is 55166147. The next prime is 55166179. The reversal of 55166161 is 16166155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16166155 = 5 ⋅3233231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55166161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55166141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130515 + ... + 130936.

It is an arithmetic number, because the mean of its divisors is an integer number (13856956).

Almost surely, 2^55166161 is an apocalyptic number.

It is an amenable number.

55166161 is a deficient number, since it is larger than the sum of its proper divisors (261663).

55166161 is a wasteful number, since it uses less digits than its factorization.

55166161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261662.

The product of its digits is 5400, while the sum is 31.

The square root of 55166161 is about 7427.3926111389. The cubic root of 55166161 is about 380.6778321980.

The spelling of 55166161 in words is "fifty-five million, one hundred sixty-six thousand, one hundred sixty-one".