6378858977 has 4 divisors (see below), whose sum is σ = 6379858836. Its totient is φ = 6377859120.

The previous prime is 6378858947. The next prime is 6378858989. The reversal of 6378858977 is 7798588736.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 699126481 + 5679732496 = 26441^2 + 75364^2 .

It is a cyclic number.

It is not a de Polignac number, because 6378858977 - 2¹⁴ = 6378842593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6378858947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490298 + ... + 503139.

It is an arithmetic number, because the mean of its divisors is an integer number (1594964709).

Almost surely, 2^6378858977 is an apocalyptic number.

It is an amenable number.

6378858977 is a deficient number, since it is larger than the sum of its proper divisors (999859).

6378858977 is an equidigital number, since it uses as much as digits as its factorization.

6378858977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999858.

The product of its digits is 142248960, while the sum is 68.

The square root of 6378858977 is about 79867.7593087474. The cubic root of 6378858977 is about 1854.5889462954.

The spelling of 6378858977 in words is "six billion, three hundred seventy-eight million, eight hundred fifty-eight thousand, nine hundred seventy-seven".