2127979666 has 8 divisors (see below), whose sum is σ = 3193530444. Its totient is φ = 1063469520.

The previous prime is 2127979643. The next prime is 2127979703. The reversal of 2127979666 is 6669797212.

It can be written as a sum of positive squares in 2 ways, for example, as 2012868225 + 115111441 = 44865^2 + 10729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 255025 + ... + 263236.

Almost surely, 2^2127979666 is an apocalyptic number.

2127979666 is a deficient number, since it is larger than the sum of its proper divisors (1065550778).

2127979666 is a wasteful number, since it uses less digits than its factorization.

2127979666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520316.

The product of its digits is 3429216, while the sum is 55.

The square root of 2127979666 is about 46130.0299804802. The cubic root of 2127979666 is about 1286.2414213775.

The spelling of 2127979666 in words is "two billion, one hundred twenty-seven million, nine hundred seventy-nine thousand, six hundred sixty-six".