27136561665 has 8 divisors (see below), whose sum is σ = 43418498688. Its totient is φ = 14472832880.

The previous prime is 27136561631. The next prime is 27136561723. The reversal of 27136561665 is 56616563172.

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

It is not a de Polignac number, because 27136561665 - 2³⁰ = 26062819841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904552041 + ... + 904552070.

It is an arithmetic number, because the mean of its divisors is an integer number (5427312336).

Almost surely, 2^27136561665 is an apocalyptic number.

It is an amenable number.

27136561665 is a deficient number, since it is larger than the sum of its proper divisors (16281937023).

27136561665 is a wasteful number, since it uses less digits than its factorization.

27136561665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809104119.

The product of its digits is 1360800, while the sum is 48.

The spelling of 27136561665 in words is "twenty-seven billion, one hundred thirty-six million, five hundred sixty-one thousand, six hundred sixty-five".