27681070081 has 4 divisors (see below), whose sum is σ = 31635508672. Its totient is φ = 23726631492.

The previous prime is 27681070069. The next prime is 27681070121. The reversal of 27681070081 is 18007018672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27681070081 - 2¹⁵ = 27681037313 is a prime.

It is a super-2 number, since 2×27681070081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27681073081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1977219285 + ... + 1977219298.

It is an arithmetic number, because the mean of its divisors is an integer number (7908877168).

Almost surely, 2^27681070081 is an apocalyptic number.

It is an amenable number.

27681070081 is a deficient number, since it is larger than the sum of its proper divisors (3954438591).

27681070081 is an equidigital number, since it uses as much as digits as its factorization.

27681070081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954438590.

The product of its (nonzero) digits is 37632, while the sum is 40.

The spelling of 27681070081 in words is "twenty-seven billion, six hundred eighty-one million, seventy thousand, eighty-one".