27979472066 has 48 divisors (see below), whose sum is σ = 55669606776. Its totient is φ = 10417688064.

The previous prime is 27979472057. The next prime is 27979472093. The reversal of 27979472066 is 66027497972.

It can be written as a sum of positive squares in 4 ways, for example, as 20787584041 + 7191888025 = 144179^2 + 84805^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27979471996 and 27979472014.

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 23 ways as a sum of consecutive naturals, for example, 624281 + ... + 667596.

Almost surely, 2^27979472066 is an apocalyptic number.

27979472066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

27979472066 is a deficient number, since it is larger than the sum of its proper divisors (27690134710).

27979472066 is a wasteful number, since it uses less digits than its factorization.

27979472066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291923 (or 1291916 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 59.

The spelling of 27979472066 in words is "twenty-seven billion, nine hundred seventy-nine million, four hundred seventy-two thousand, sixty-six".