7864422857 has 2 divisors, whose sum is σ = 7864422858. Its totient is φ = 7864422856.

The previous prime is 7864422833. The next prime is 7864422871. The reversal of 7864422857 is 7582244687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7747696441 + 116726416 = 88021^2 + 10804^2 .

It is a cyclic number.

It is not a de Polignac number, because 7864422857 - 2⁶ = 7864422793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7864422799 and 7864422808.

It is not a weakly prime, because it can be changed into another prime (7864421857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932211428 + 3932211429.

It is an arithmetic number, because the mean of its divisors is an integer number (3932211429).

Almost surely, 2^7864422857 is an apocalyptic number.

It is an amenable number.

7864422857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7864422857 is an equidigital number, since it uses as much as digits as its factorization.

7864422857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6021120, while the sum is 53.

The square root of 7864422857 is about 88681.5812725506. The cubic root of 7864422857 is about 1988.6374734942.

The spelling of 7864422857 in words is "seven billion, eight hundred sixty-four million, four hundred twenty-two thousand, eight hundred fifty-seven".