53865563 has 4 divisors (see below), whose sum is σ = 56207568. Its totient is φ = 51523560.

The previous prime is 53865533. The next prime is 53865577. The reversal of 53865563 is 36556835.

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

It is a cyclic number.

It is not a de Polignac number, because 53865563 - 2⁸ = 53865307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53865563.

It is not an unprimeable number, because it can be changed into a prime (53865533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170968 + ... + 1171013.

It is an arithmetic number, because the mean of its divisors is an integer number (14051892).

Almost surely, 2^53865563 is an apocalyptic number.

53865563 is a deficient number, since it is larger than the sum of its proper divisors (2342005).

53865563 is a wasteful number, since it uses less digits than its factorization.

53865563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342004.

The product of its digits is 324000, while the sum is 41.

The square root of 53865563 is about 7339.3162488068. The cubic root of 53865563 is about 377.6623876309.

The spelling of 53865563 in words is "fifty-three million, eight hundred sixty-five thousand, five hundred sixty-three".