55021165 has 4 divisors (see below), whose sum is σ = 66025404. Its totient is φ = 44016928.

The previous prime is 55021159. The next prime is 55021171. The reversal of 55021165 is 56112055.

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

It is an interprime number because it is at equal distance from previous prime (55021159) and next prime (55021171).

It can be written as a sum of positive squares in 2 ways, for example, as 29800681 + 25220484 = 5459^2 + 5022^2 .

It is a cyclic number.

It is not a de Polignac number, because 55021165 - 2³ = 55021157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5502112 + ... + 5502121.

It is an arithmetic number, because the mean of its divisors is an integer number (16506351).

Almost surely, 2^55021165 is an apocalyptic number.

It is an amenable number.

55021165 is a deficient number, since it is larger than the sum of its proper divisors (11004239).

55021165 is a wasteful number, since it uses less digits than its factorization.

55021165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11004238.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 55021165 is about 7417.6252938525. The cubic root of 55021165 is about 380.3440213285.

The spelling of 55021165 in words is "fifty-five million, twenty-one thousand, one hundred sixty-five".