53506565 has 32 divisors (see below), whose sum is σ = 81803520. Its totient is φ = 32707584.

The previous prime is 53506553. The next prime is 53506567. The reversal of 53506565 is 56560535.

It is not a de Polignac number, because 53506565 - 2¹⁰ = 53505541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53506567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8939 + ... + 13671.

It is an arithmetic number, because the mean of its divisors is an integer number (2556360).

Almost surely, 2^53506565 is an apocalyptic number.

It is an amenable number.

53506565 is a deficient number, since it is larger than the sum of its proper divisors (28296955).

53506565 is a wasteful number, since it uses less digits than its factorization.

53506565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781.

The product of its (nonzero) digits is 67500, while the sum is 35.

The square root of 53506565 is about 7314.8181795585. The cubic root of 53506565 is about 376.8215142000.

The spelling of 53506565 in words is "fifty-three million, five hundred six thousand, five hundred sixty-five".