27435945681 has 6 divisors (see below), whose sum is σ = 39629699330. Its totient is φ = 18290630448.

The previous prime is 27435945653. The next prime is 27435945689. The reversal of 27435945681 is 18654953472.

It is a happy number.

27435945681 is a `hidden beast` number, since 2 + 7 + 43 + 594 + 5 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26314030656 + 1121915025 = 162216^2 + 33495^2 .

It is not a de Polignac number, because 27435945681 - 2⁷ = 27435945553 is a prime.

It is a super-2 number, since 2×27435945681² (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 (27435945689) 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 5 ways as a sum of consecutive naturals, for example, 1524219196 + ... + 1524219213.

Almost surely, 2^27435945681 is an apocalyptic number.

It is an amenable number.

27435945681 is a deficient number, since it is larger than the sum of its proper divisors (12193753649).

27435945681 is a wasteful number, since it uses less digits than its factorization.

27435945681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048438415 (or 3048438412 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 27435945681 in words is "twenty-seven billion, four hundred thirty-five million, nine hundred forty-five thousand, six hundred eighty-one".