6660495779 has 8 divisors (see below), whose sum is σ = 7942951680. Its totient is φ = 5460779016.

The previous prime is 6660495727. The next prime is 6660495791. The reversal of 6660495779 is 9775940666.

It is a happy number.

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

It is not a de Polignac number, because 6660495779 - 2²⁴ = 6643718563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660495799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20684609 + ... + 20684930.

It is an arithmetic number, because the mean of its divisors is an integer number (992868960).

Almost surely, 2^6660495779 is an apocalyptic number.

6660495779 is a deficient number, since it is larger than the sum of its proper divisors (1282455901).

6660495779 is a wasteful number, since it uses less digits than its factorization.

6660495779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41369569.

The product of its (nonzero) digits is 17146080, while the sum is 59.

The square root of 6660495779 is about 81611.8605289697. The cubic root of 6660495779 is about 1881.4911757348.

The spelling of 6660495779 in words is "six billion, six hundred sixty million, four hundred ninety-five thousand, seven hundred seventy-nine".