27608911981 has 16 divisors (see below), whose sum is σ = 31678382080. Its totient is φ = 23570941680.

The previous prime is 27608911937. The next prime is 27608911987. The reversal of 27608911981 is 18911980672.

It is a cyclic number.

It is not a de Polignac number, because 27608911981 - 2¹⁷ = 27608780909 is a prime.

It is a super-2 number, since 2×27608911981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27608911987) 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 15 ways as a sum of consecutive naturals, for example, 2200516 + ... + 2213026.

It is an arithmetic number, because the mean of its divisors is an integer number (1979898880).

Almost surely, 2^27608911981 is an apocalyptic number.

It is an amenable number.

27608911981 is a deficient number, since it is larger than the sum of its proper divisors (4069470099).

27608911981 is a wasteful number, since it uses less digits than its factorization.

27608911981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13744.

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 27608911981 in words is "twenty-seven billion, six hundred eight million, nine hundred eleven thousand, nine hundred eighty-one".