8420815443437 has 2 divisors, whose sum is σ = 8420815443438. Its totient is φ = 8420815443436.

The previous prime is 8420815443413. The next prime is 8420815443511. The reversal of 8420815443437 is 7343445180248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8349031101961 + 71784341476 = 2889469^2 + 267926^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420815443437 - 2⁶ = 8420815443373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8420815443737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210407721718 + 4210407721719.

It is an arithmetic number, because the mean of its divisors is an integer number (4210407721719).

Almost surely, 2^{8420815443437} is an apocalyptic number.

It is an amenable number.

8420815443437 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420815443437 is an equidigital number, since it uses as much as digits as its factorization.

8420815443437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10321920, while the sum is 53.

The spelling of 8420815443437 in words is "eight trillion, four hundred twenty billion, eight hundred fifteen million, four hundred forty-three thousand, four hundred thirty-seven".