8420847566 has 16 divisors (see below), whose sum is σ = 13385539440. Its totient is φ = 3966083520.

The previous prime is 8420847551. The next prime is 8420847569. The reversal of 8420847566 is 6657480248.

8420847566 = 7084² + 7085² + ... + 7247².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420847569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768196 + ... + 1772951.

It is an arithmetic number, because the mean of its divisors is an integer number (836596215).

Almost surely, 2^8420847566 is an apocalyptic number.

8420847566 is a deficient number, since it is larger than the sum of its proper divisors (4964691874).

8420847566 is a wasteful number, since it uses less digits than its factorization.

8420847566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541219.

The product of its (nonzero) digits is 2580480, while the sum is 50.

The square root of 8420847566 is about 91765.1762162532. The cubic root of 8420847566 is about 2034.4730219321.

The spelling of 8420847566 in words is "eight billion, four hundred twenty million, eight hundred forty-seven thousand, five hundred sixty-six".