6655378879 has 4 divisors (see below), whose sum is σ = 6810155176. Its totient is φ = 6500602584.

The previous prime is 6655378861. The next prime is 6655378897. The reversal of 6655378879 is 9788735566.

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

It is an interprime number because it is at equal distance from previous prime (6655378861) and next prime (6655378897).

It is a cyclic number.

It is not a de Polignac number, because 6655378879 - 2¹⁵ = 6655346111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6655378879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659378879) by changing a digit.

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, 77388084 + ... + 77388169.

It is an arithmetic number, because the mean of its divisors is an integer number (1702538794).

Almost surely, 2^6655378879 is an apocalyptic number.

6655378879 is a deficient number, since it is larger than the sum of its proper divisors (154776297).

6655378879 is a wasteful number, since it uses less digits than its factorization.

6655378879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154776296.

The product of its digits is 76204800, while the sum is 64.

The square root of 6655378879 is about 81580.5055083627. The cubic root of 6655378879 is about 1881.0092362029.

The spelling of 6655378879 in words is "six billion, six hundred fifty-five million, three hundred seventy-eight thousand, eight hundred seventy-nine".