36664561 has 4 divisors (see below), whose sum is σ = 36677092. Its totient is φ = 36652032.

The previous prime is 36664549. The next prime is 36664583. The reversal of 36664561 is 16546663.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 34152336 = 1585^2 + 5844^2 .

It is a cyclic number.

It is not a de Polignac number, because 36664561 - 2¹⁷ = 36533489 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 36664561.

It is not an unprimeable number, because it can be changed into a prime (36664531) 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, 721 + ... + 8593.

It is an arithmetic number, because the mean of its divisors is an integer number (9169273).

Almost surely, 2^36664561 is an apocalyptic number.

It is an amenable number.

36664561 is a deficient number, since it is larger than the sum of its proper divisors (12531).

36664561 is an equidigital number, since it uses as much as digits as its factorization.

36664561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12530.

The product of its digits is 77760, while the sum is 37.

The square root of 36664561 is about 6055.1268359961. The cubic root of 36664561 is about 332.2121382150.

The spelling of 36664561 in words is "thirty-six million, six hundred sixty-four thousand, five hundred sixty-one".