6418778373 has 36 divisors (see below), whose sum is σ = 10791589068. Its totient is φ = 3665733120.

The previous prime is 6418778369. The next prime is 6418778393. The reversal of 6418778373 is 3738778146.

It can be written as a sum of positive squares in 2 ways, for example, as 1133197569 + 5285580804 = 33663^2 + 72702^2 .

It is not a de Polignac number, because 6418778373 - 2² = 6418778369 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6418778393) 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 35 ways as a sum of consecutive naturals, for example, 1046965 + ... + 1053077.

It is an arithmetic number, because the mean of its divisors is an integer number (299766363).

Almost surely, 2^6418778373 is an apocalyptic number.

6418778373 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

6418778373 is a deficient number, since it is larger than the sum of its proper divisors (4372810695).

6418778373 is a wasteful number, since it uses less digits than its factorization.

6418778373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8514 (or 8504 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The square root of 6418778373 is about 80117.2788666715. The cubic root of 6418778373 is about 1858.4496246467.

The spelling of 6418778373 in words is "six billion, four hundred eighteen million, seven hundred seventy-eight thousand, three hundred seventy-three".