55406165 has 4 divisors (see below), whose sum is σ = 66487404. Its totient is φ = 44324928.

The previous prime is 55406161. The next prime is 55406167. The reversal of 55406165 is 56160455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21031396 + 34374769 = 4586^2 + 5863^2 .

It is a cyclic number.

It is not a de Polignac number, because 55406165 - 2² = 55406161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55406161) 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, 5540612 + ... + 5540621.

It is an arithmetic number, because the mean of its divisors is an integer number (16621851).

Almost surely, 2^55406165 is an apocalyptic number.

It is an amenable number.

55406165 is a deficient number, since it is larger than the sum of its proper divisors (11081239).

55406165 is a wasteful number, since it uses less digits than its factorization.

55406165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11081238.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 55406165 is about 7443.5317558267. The cubic root of 55406165 is about 381.2290881659.

The spelling of 55406165 in words is "fifty-five million, four hundred six thousand, one hundred sixty-five".