27663968661 has 12 divisors (see below), whose sum is σ = 42907380192. Its totient is φ = 15807982008.

The previous prime is 27663968659. The next prime is 27663968677. The reversal of 27663968661 is 16686936672.

It is not a de Polignac number, because 27663968661 - 2¹ = 27663968659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27663968595 and 27663968604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27663968261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94094985 + ... + 94095278.

It is an arithmetic number, because the mean of its divisors is an integer number (3575615016).

Almost surely, 2^27663968661 is an apocalyptic number.

27663968661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27663968661 is a deficient number, since it is larger than the sum of its proper divisors (15243411531).

27663968661 is a wasteful number, since it uses less digits than its factorization.

27663968661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188190280 (or 188190273 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 60.

The spelling of 27663968661 in words is "twenty-seven billion, six hundred sixty-three million, nine hundred sixty-eight thousand, six hundred sixty-one".