27661630864 has 20 divisors (see below), whose sum is σ = 61250754304. Its totient is φ = 11854984608.

The previous prime is 27661630837. The next prime is 27661630873. The reversal of 27661630864 is 46803616672.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123489312 + ... + 123489535.

Almost surely, 2^27661630864 is an apocalyptic number.

It is an amenable number.

27661630864 is an abundant number, since it is smaller than the sum of its proper divisors (33589123440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27661630864 is a wasteful number, since it uses less digits than its factorization.

27661630864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246978862 (or 246978856 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 27661630864 in words is "twenty-seven billion, six hundred sixty-one million, six hundred thirty thousand, eight hundred sixty-four".