820246619791843 has 2 divisors, whose sum is σ = 820246619791844. Its totient is φ = 820246619791842.

The previous prime is 820246619791829. The next prime is 820246619791903. The reversal of 820246619791843 is 348197916642028.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820246619791843 is a prime.

It is not a weakly prime, because it can be changed into another prime (820246619792843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410123309895921 + 410123309895922.

It is an arithmetic number, because the mean of its divisors is an integer number (410123309895922).

Almost surely, 2^{820246619791843} is an apocalyptic number.

820246619791843 is a deficient number, since it is larger than the sum of its proper divisors (1).

820246619791843 is an equidigital number, since it uses as much as digits as its factorization.

820246619791843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250822656, while the sum is 70.

The spelling of 820246619791843 in words is "eight hundred twenty trillion, two hundred forty-six billion, six hundred nineteen million, seven hundred ninety-one thousand, eight hundred forty-three".