6677778887 has 8 divisors (see below), whose sum is σ = 7313344080. Its totient is φ = 6059626560.

The previous prime is 6677778881. The next prime is 6677778889. The reversal of 6677778887 is 7888777766.

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

It is not a de Polignac number, because 6677778887 - 2¹⁰ = 6677777863 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 6677778887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6677778881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4352414 + ... + 4353947.

It is an arithmetic number, because the mean of its divisors is an integer number (914168010).

Almost surely, 2^6677778887 is an apocalyptic number.

6677778887 is a deficient number, since it is larger than the sum of its proper divisors (635565193).

6677778887 is a wasteful number, since it uses less digits than its factorization.

6677778887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706433.

The product of its digits is 309786624, while the sum is 71.

The square root of 6677778887 is about 81717.6779344592. The cubic root of 6677778887 is about 1883.1171772665.

The spelling of 6677778887 in words is "six billion, six hundred seventy-seven million, seven hundred seventy-eight thousand, eight hundred eighty-seven".