7859978641 has 2 divisors, whose sum is σ = 7859978642. Its totient is φ = 7859978640.

The previous prime is 7859978639. The next prime is 7859978701. The reversal of 7859978641 is 1468799587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7690588416 + 169390225 = 87696^2 + 13015^2 .

It is a cyclic number.

It is not a de Polignac number, because 7859978641 - 2¹ = 7859978639 is a prime.

Together with 7859978639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7859978341) 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 as a sum of consecutive naturals, namely, 3929989320 + 3929989321.

It is an arithmetic number, because the mean of its divisors is an integer number (3929989321).

Almost surely, 2^7859978641 is an apocalyptic number.

It is an amenable number.

7859978641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7859978641 is an equidigital number, since it uses as much as digits as its factorization.

7859978641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 64.

The square root of 7859978641 is about 88656.5205780150. The cubic root of 7859978641 is about 1988.2628073152.

The spelling of 7859978641 in words is "seven billion, eight hundred fifty-nine million, nine hundred seventy-eight thousand, six hundred forty-one".