27363445561 has 9 divisors (see below), whose sum is σ = 27711001839. Its totient is φ = 27020201136.

The previous prime is 27363445553. The next prime is 27363445589. The reversal of 27363445561 is 16554436372.

It is a happy number.

The square root of 27363445561 is 165419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20026495225 + 7336950336 = 141515^2 + 85656^2 .

It is not a de Polignac number, because 27363445561 - 2³ = 27363445553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27363485561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13728781 + ... + 13730773.

Almost surely, 2^27363445561 is an apocalyptic number.

27363445561 is the 165419-th square number.

27363445561 is the 82710-th centered octagonal number.

It is an amenable number.

27363445561 is a deficient number, since it is larger than the sum of its proper divisors (347556278).

27363445561 is an frugal number, since it uses more digits than its factorization.

27363445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152 (or 2076 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 46.

The spelling of 27363445561 in words is "twenty-seven billion, three hundred sixty-three million, four hundred forty-five thousand, five hundred sixty-one".