8256420947 has 2 divisors, whose sum is σ = 8256420948. Its totient is φ = 8256420946.

The previous prime is 8256420937. The next prime is 8256420979. The reversal of 8256420947 is 7490246528.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8256420947 - 2¹² = 8256416851 is a prime.

It is not a weakly prime, because it can be changed into another prime (8256420937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4128210473 + 4128210474.

It is an arithmetic number, because the mean of its divisors is an integer number (4128210474).

Almost surely, 2^8256420947 is an apocalyptic number.

8256420947 is a deficient number, since it is larger than the sum of its proper divisors (1).

8256420947 is an equidigital number, since it uses as much as digits as its factorization.

8256420947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 8256420947 is about 90864.8498980766. The cubic root of 8256420947 is about 2021.1440882706.

The spelling of 8256420947 in words is "eight billion, two hundred fifty-six million, four hundred twenty thousand, nine hundred forty-seven".