27661281912179 has 2 divisors, whose sum is σ = 27661281912180. Its totient is φ = 27661281912178.

The previous prime is 27661281912113. The next prime is 27661281912197. The reversal of 27661281912179 is 97121918216672.

Together with next prime (27661281912197) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27661281912179 - 2²⁰ = 27661280863603 is a prime.

It is a super-2 number, since 2×27661281912179² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27661281912679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830640956089 + 13830640956090.

It is an arithmetic number, because the mean of its divisors is an integer number (13830640956090).

Almost surely, 2^{27661281912179} is an apocalyptic number.

27661281912179 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661281912179 is an equidigital number, since it uses as much as digits as its factorization.

27661281912179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 62.

The spelling of 27661281912179 in words is "twenty-seven trillion, six hundred sixty-one billion, two hundred eighty-one million, nine hundred twelve thousand, one hundred seventy-nine".