27768861165 has 16 divisors (see below), whose sum is σ = 45863410176. Its totient is φ = 14332315200.

The previous prime is 27768861161. The next prime is 27768861199. The reversal of 27768861165 is 56116886772.

It is a happy number.

It is not a de Polignac number, because 27768861165 - 2² = 27768861161 is a prime.

It is a super-2 number, since 2×27768861165² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27768861161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29858526 + ... + 29859455.

It is an arithmetic number, because the mean of its divisors is an integer number (2866463136).

Almost surely, 2^27768861165 is an apocalyptic number.

It is an amenable number.

27768861165 is a deficient number, since it is larger than the sum of its proper divisors (18094549011).

27768861165 is a wasteful number, since it uses less digits than its factorization.

27768861165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59718020.

The product of its digits is 6773760, while the sum is 57.

The spelling of 27768861165 in words is "twenty-seven billion, seven hundred sixty-eight million, eight hundred sixty-one thousand, one hundred sixty-five".