36665563 has 4 divisors (see below), whose sum is σ = 39998808. Its totient is φ = 33332320.

The previous prime is 36665539. The next prime is 36665581. The reversal of 36665563 is 36556663.

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 36665563 - 2²⁵ = 3111131 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (36665513) 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, 1666606 + ... + 1666627.

It is an arithmetic number, because the mean of its divisors is an integer number (9999702).

Almost surely, 2^36665563 is an apocalyptic number.

36665563 is a deficient number, since it is larger than the sum of its proper divisors (3333245).

36665563 is a wasteful number, since it uses less digits than its factorization.

36665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333244.

The product of its digits is 291600, while the sum is 40.

The square root of 36665563 is about 6055.2095752335. The cubic root of 36665563 is about 332.2151645118.

Subtracting from 36665563 its reverse (36556663), we obtain a square (108900 = 330²).

It can be divided in two parts, 3666 and 5563, that added together give a palindrome (9229).

The spelling of 36665563 in words is "thirty-six million, six hundred sixty-five thousand, five hundred sixty-three".