36665521 has 4 divisors (see below), whose sum is σ = 37559844. Its totient is φ = 35771200.

The previous prime is 36665513. The next prime is 36665537. The reversal of 36665521 is 12556663.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13249600 + 23415921 = 3640^2 + 4839^2 .

It is a cyclic number.

It is not a de Polignac number, because 36665521 - 2³ = 36665513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36665501) 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, 447100 + ... + 447181.

It is an arithmetic number, because the mean of its divisors is an integer number (9389961).

Almost surely, 2^36665521 is an apocalyptic number.

It is an amenable number.

36665521 is a deficient number, since it is larger than the sum of its proper divisors (894323).

36665521 is an equidigital number, since it uses as much as digits as its factorization.

36665521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894322.

The product of its digits is 32400, while the sum is 34.

The square root of 36665521 is about 6055.2061071445. The cubic root of 36665521 is about 332.2150376622.

The spelling of 36665521 in words is "thirty-six million, six hundred sixty-five thousand, five hundred twenty-one".