8420086643 has 2 divisors, whose sum is σ = 8420086644. Its totient is φ = 8420086642.

The previous prime is 8420086639. The next prime is 8420086699. The reversal of 8420086643 is 3466800248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8420086643 - 2² = 8420086639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8420086643.

It is not a weakly prime, because it can be changed into another prime (8420086603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210043321 + 4210043322.

It is an arithmetic number, because the mean of its divisors is an integer number (4210043322).

Almost surely, 2^8420086643 is an apocalyptic number.

8420086643 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420086643 is an equidigital number, since it uses as much as digits as its factorization.

8420086643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 8420086643 is about 91761.0300890307. The cubic root of 8420086643 is about 2034.4117405336.

The spelling of 8420086643 in words is "eight billion, four hundred twenty million, eighty-six thousand, six hundred forty-three".