53566865 has 16 divisors (see below), whose sum is σ = 70825536. Its totient is φ = 38568000.

The previous prime is 53566823. The next prime is 53566879. The reversal of 53566865 is 56866535.

53566865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 53566865 - 2¹⁴ = 53550481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734 + ... + 10376.

It is an arithmetic number, because the mean of its divisors is an integer number (4426596).

Almost surely, 2^53566865 is an apocalyptic number.

53566865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

53566865 is a deficient number, since it is larger than the sum of its proper divisors (17258671).

53566865 is a wasteful number, since it uses less digits than its factorization.

53566865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9760.

The product of its digits is 648000, while the sum is 44.

The square root of 53566865 is about 7318.9387891961. The cubic root of 53566865 is about 376.9630158824.

It can be divided in two parts, 5356 and 6865, that added together give a palindrome (12221).

The spelling of 53566865 in words is "fifty-three million, five hundred sixty-six thousand, eight hundred sixty-five".