36663553561 has 4 divisors (see below), whose sum is σ = 37654460452. Its totient is φ = 35672646672.

The previous prime is 36663553517. The next prime is 36663553571. The reversal of 36663553561 is 16535536663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16535536663 = 47 ⋅351819929.

It can be written as a sum of positive squares in 2 ways, for example, as 22927713561 + 13735840000 = 151419^2 + 117200^2 .

It is a cyclic number.

It is not a de Polignac number, because 36663553561 - 2¹⁵ = 36663520793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36663553501) 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, 495453390 + ... + 495453463.

It is an arithmetic number, because the mean of its divisors is an integer number (9413615113).

Almost surely, 2^36663553561 is an apocalyptic number.

It is an amenable number.

36663553561 is a deficient number, since it is larger than the sum of its proper divisors (990906891).

36663553561 is an equidigital number, since it uses as much as digits as its factorization.

36663553561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990906890.

The product of its digits is 4374000, while the sum is 49.

The spelling of 36663553561 in words is "thirty-six billion, six hundred sixty-three million, five hundred fifty-three thousand, five hundred sixty-one".