27726661686 has 16 divisors (see below), whose sum is σ = 55876632768. Its totient is φ = 9171669000.

The previous prime is 27726661663. The next prime is 27726661693. The reversal of 27726661686 is 68616662772.

It is a congruent number.

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, 17637040 + ... + 17638611.

It is an arithmetic number, because the mean of its divisors is an integer number (3492289548).

Almost surely, 2^27726661686 is an apocalyptic number.

27726661686 is an abundant number, since it is smaller than the sum of its proper divisors (28149971082).

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

27726661686 is a wasteful number, since it uses less digits than its factorization.

27726661686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35275787.

The product of its digits is 12192768, while the sum is 57.

The spelling of 27726661686 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred sixty-one thousand, six hundred eighty-six".