55516565 has 16 divisors (see below), whose sum is σ = 72173808. Its totient is φ = 40751616.

The previous prime is 55516553. The next prime is 55516589. The reversal of 55516565 is 56561555.

It can be written as a sum of positive squares in 8 ways, for example, as 192721 + 55323844 = 439^2 + 7438^2 .

It is a cyclic number.

It is not a de Polignac number, because 55516565 - 2¹⁶ = 55451029 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 15 ways as a sum of consecutive naturals, for example, 8777 + ... + 13713.

It is an arithmetic number, because the mean of its divisors is an integer number (4510863).

Almost surely, 2^55516565 is an apocalyptic number.

It is an amenable number.

55516565 is a deficient number, since it is larger than the sum of its proper divisors (16657243).

55516565 is a wasteful number, since it uses less digits than its factorization.

55516565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128.

The product of its digits is 112500, while the sum is 38.

The square root of 55516565 is about 7450.9438999364. The cubic root of 55516565 is about 381.4821272046.

The spelling of 55516565 in words is "fifty-five million, five hundred sixteen thousand, five hundred sixty-five".