27136561664 has 20 divisors (see below), whose sum is σ = 54220123254. Its totient is φ = 13568280576.

The previous prime is 27136561631. The next prime is 27136561723. The reversal of 27136561664 is 46616563172.

It can be written as a sum of positive squares in only one way, i.e., 24812550400 + 2324011264 = 157520^2 + 48208^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26500037 + ... + 26501060.

Almost surely, 2^27136561664 is an apocalyptic number.

It is an amenable number.

27136561664 is a deficient number, since it is larger than the sum of its proper divisors (27083561590).

27136561664 is an frugal number, since it uses more digits than its factorization.

27136561664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53001115 (or 53001099 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The spelling of 27136561664 in words is "twenty-seven billion, one hundred thirty-six million, five hundred sixty-one thousand, six hundred sixty-four".