6378856397 has 2 divisors, whose sum is σ = 6378856398. Its totient is φ = 6378856396.

The previous prime is 6378856387. The next prime is 6378856447. The reversal of 6378856397 is 7936588736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6282306121 + 96550276 = 79261^2 + 9826^2 .

It is a cyclic number.

It is not a de Polignac number, because 6378856397 - 2⁴ = 6378856381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6378856307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3189428198 + 3189428199.

It is an arithmetic number, because the mean of its divisors is an integer number (3189428199).

Almost surely, 2^6378856397 is an apocalyptic number.

It is an amenable number.

6378856397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6378856397 is an equidigital number, since it uses as much as digits as its factorization.

6378856397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45722880, while the sum is 62.

The square root of 6378856397 is about 79867.7431570468. The cubic root of 6378856397 is about 1854.5886962590.

The spelling of 6378856397 in words is "six billion, three hundred seventy-eight million, eight hundred fifty-six thousand, three hundred ninety-seven".