6378445825 has 18 divisors (see below), whose sum is σ = 8347471494. Its totient is φ = 4834183680.

The previous prime is 6378445823. The next prime is 6378445897. The reversal of 6378445825 is 5285448736.

It can be written as a sum of positive squares in 3 ways, for example, as 43718544 + 6334727281 = 6612^2 + 79591^2 .

It is not a de Polignac number, because 6378445825 - 2¹ = 6378445823 is a prime.

It is a super-2 number, since 2×6378445825² = 81369142284919861250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6378445823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 344352 + ... + 362401.

Almost surely, 2^6378445825 is an apocalyptic number.

It is an amenable number.

6378445825 is a deficient number, since it is larger than the sum of its proper divisors (1969025669).

6378445825 is a wasteful number, since it uses less digits than its factorization.

6378445825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706801 (or 706777 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 52.

The square root of 6378445825 is about 79865.1727913989. The cubic root of 6378445825 is about 1854.5489055045.

The spelling of 6378445825 in words is "six billion, three hundred seventy-eight million, four hundred forty-five thousand, eight hundred twenty-five".