27561561455 has 8 divisors (see below), whose sum is σ = 33076333104. Its totient is φ = 22047609600.

The previous prime is 27561561451. The next prime is 27561561637. The reversal of 27561561455 is 55416516572.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27561561455 - 2² = 27561561451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27561561451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128381 + ... + 267590.

It is an arithmetic number, because the mean of its divisors is an integer number (4134541638).

Almost surely, 2^27561561455 is an apocalyptic number.

27561561455 is a deficient number, since it is larger than the sum of its proper divisors (5514771649).

27561561455 is a wasteful number, since it uses less digits than its factorization.

27561561455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409897.

The product of its digits is 1260000, while the sum is 47.

The spelling of 27561561455 in words is "twenty-seven billion, five hundred sixty-one million, five hundred sixty-one thousand, four hundred fifty-five".