55056161 has 4 divisors (see below), whose sum is σ = 55177092. Its totient is φ = 54935232.

The previous prime is 55056143. The next prime is 55056163. The reversal of 55056161 is 16165055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16165055 = 5 ⋅3233011.

It can be written as a sum of positive squares in 2 ways, for example, as 52635025 + 2421136 = 7255^2 + 1556^2 .

It is a cyclic number.

It is not a de Polignac number, because 55056161 - 2¹⁸ = 54794017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55056163) 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, 59780 + ... + 60693.

It is an arithmetic number, because the mean of its divisors is an integer number (13794273).

Almost surely, 2^55056161 is an apocalyptic number.

It is an amenable number.

55056161 is a deficient number, since it is larger than the sum of its proper divisors (120931).

55056161 is a wasteful number, since it uses less digits than its factorization.

55056161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120930.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 55056161 is about 7419.9838948612. The cubic root of 55056161 is about 380.4246430210.

The spelling of 55056161 in words is "fifty-five million, fifty-six thousand, one hundred sixty-one".