6418778378 has 8 divisors (see below), whose sum is σ = 9809831268. Its totient is φ = 3148834624.

The previous prime is 6418778369. The next prime is 6418778393. The reversal of 6418778378 is 8738778146.

It can be written as a sum of positive squares in 2 ways, for example, as 6021294409 + 397483969 = 77597^2 + 19937^2 .

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

It is an unprimeable number.

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, 30277151 + ... + 30277362.

Almost surely, 2^6418778378 is an apocalyptic number.

6418778378 is a deficient number, since it is larger than the sum of its proper divisors (3391052890).

6418778378 is a wasteful number, since it uses less digits than its factorization.

6418778378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60554568.

The product of its digits is 12644352, while the sum is 59.

The square root of 6418778378 is about 80117.2788978757. The cubic root of 6418778378 is about 1858.4496251292.

The spelling of 6418778378 in words is "six billion, four hundred eighteen million, seven hundred seventy-eight thousand, three hundred seventy-eight".