27655895761 has 4 divisors (see below), whose sum is σ = 29783272372. Its totient is φ = 25528519152.

The previous prime is 27655895747. The next prime is 27655895777. The reversal of 27655895761 is 16759855672.

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 15280668225 + 12375227536 = 123615^2 + 111244^2 .

It is a cyclic number.

It is not a de Polignac number, because 27655895761 - 2⁷ = 27655895633 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 27655895761.

It is not an unprimeable number, because it can be changed into a prime (27655895731) 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 3 ways as a sum of consecutive naturals, for example, 1063688286 + ... + 1063688311.

It is an arithmetic number, because the mean of its divisors is an integer number (7445818093).

Almost surely, 2^27655895761 is an apocalyptic number.

It is an amenable number.

27655895761 is a deficient number, since it is larger than the sum of its proper divisors (2127376611).

27655895761 is a wasteful number, since it uses less digits than its factorization.

27655895761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127376610.

The product of its digits is 31752000, while the sum is 61.

The spelling of 27655895761 in words is "twenty-seven billion, six hundred fifty-five million, eight hundred ninety-five thousand, seven hundred sixty-one".