27640982666 has 32 divisors (see below), whose sum is σ = 45440559360. Its totient is φ = 12505881600.

The previous prime is 27640982647. The next prime is 27640982683. The reversal of 27640982666 is 66628904672.

It is a happy number.

It is a super-2 number, since 2×27640982666² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10593170 + ... + 10595778.

It is an arithmetic number, because the mean of its divisors is an integer number (1420017480).

Almost surely, 2^27640982666 is an apocalyptic number.

27640982666 is a deficient number, since it is larger than the sum of its proper divisors (17799576694).

27640982666 is a wasteful number, since it uses less digits than its factorization.

27640982666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 27640982666 in words is "twenty-seven billion, six hundred forty million, nine hundred eighty-two thousand, six hundred sixty-six".