27239636681 has 8 divisors (see below), whose sum is σ = 27689243400. Its totient is φ = 26790128640.

The previous prime is 27239636659. The next prime is 27239636687. The reversal of 27239636681 is 18663693272.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 682045456 + 26557591225 = 26116^2 + 162965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27239636681 - 2⁶ = 27239636617 is a prime.

It is a super-2 number, since 2×27239636681² (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 (27239636687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711455 + ... + 748763.

It is an arithmetic number, because the mean of its divisors is an integer number (3461155425).

Almost surely, 2^27239636681 is an apocalyptic number.

It is an amenable number.

27239636681 is a deficient number, since it is larger than the sum of its proper divisors (449606719).

27239636681 is a wasteful number, since it uses less digits than its factorization.

27239636681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49339.

The product of its digits is 3919104, while the sum is 53.

The spelling of 27239636681 in words is "twenty-seven billion, two hundred thirty-nine million, six hundred thirty-six thousand, six hundred eighty-one".