53666568 has 24 divisors (see below), whose sum is σ = 145347150. Its totient is φ = 17888832.

The previous prime is 53666563. The next prime is 53666629. The reversal of 53666568 is 86566635.

It can be written as a sum of positive squares in only one way, i.e., 44916804 + 8749764 = 6702^2 + 2958^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (53666563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 372613 + ... + 372756.

Almost surely, 2^53666568 is an apocalyptic number.

It is an amenable number.

53666568 is an abundant number, since it is smaller than the sum of its proper divisors (91680582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53666568 is a wasteful number, since it uses less digits than its factorization.

53666568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745381 (or 745374 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 53666568 is about 7325.7469243757. The cubic root of 53666568 is about 377.1967489890.

The spelling of 53666568 in words is "fifty-three million, six hundred sixty-six thousand, five hundred sixty-eight".