6660694279 has 4 divisors (see below), whose sum is σ = 6699195576. Its totient is φ = 6622192984.

The previous prime is 6660694273. The next prime is 6660694291. The reversal of 6660694279 is 9724960666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6660694279 - 2⁷ = 6660694151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660694273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19250389 + ... + 19250734.

It is an arithmetic number, because the mean of its divisors is an integer number (1674798894).

Almost surely, 2^6660694279 is an apocalyptic number.

6660694279 is a deficient number, since it is larger than the sum of its proper divisors (38501297).

6660694279 is a wasteful number, since it uses less digits than its factorization.

6660694279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38501296.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The square root of 6660694279 is about 81613.0766421656. The cubic root of 6660694279 is about 1881.5098666502.

The spelling of 6660694279 in words is "six billion, six hundred sixty million, six hundred ninety-four thousand, two hundred seventy-nine".