6278778025 has 12 divisors (see below), whose sum is σ = 8384584012. Its totient is φ = 4636635840.

The previous prime is 6278778013. The next prime is 6278778043. The reversal of 6278778025 is 5208778726.

It can be written as a sum of positive squares in 6 ways, for example, as 551921049 + 5726856976 = 23493^2 + 75676^2 .

It is not a de Polignac number, because 6278778025 - 2¹¹ = 6278775977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9659334 + ... + 9659983.

Almost surely, 2^6278778025 is an apocalyptic number.

6278778025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6278778025 is a deficient number, since it is larger than the sum of its proper divisors (2105805987).

6278778025 is a wasteful number, since it uses less digits than its factorization.

6278778025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19319340 (or 19319335 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 52.

The square root of 6278778025 is about 79238.7406828251. The cubic root of 6278778025 is about 1844.8385985037.

The spelling of 6278778025 in words is "six billion, two hundred seventy-eight million, seven hundred seventy-eight thousand, twenty-five".