857441894369 has 2 divisors, whose sum is σ = 857441894370. Its totient is φ = 857441894368.

The previous prime is 857441894363. The next prime is 857441894437. The reversal of 857441894369 is 963498144758.

It is an a-pointer prime, because the next prime (857441894437) can be obtained adding 857441894369 to its sum of digits (68).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 470945925025 + 386495969344 = 686255^2 + 621688^2 .

It is a cyclic number.

It is not a de Polignac number, because 857441894369 - 2³⁶ = 788722417633 is a prime.

It is a super-2 number, since 2×857441894369² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 857441894299 and 857441894308.

It is not a weakly prime, because it can be changed into another prime (857441894363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428720947184 + 428720947185.

It is an arithmetic number, because the mean of its divisors is an integer number (428720947185).

Almost surely, 2^857441894369 is an apocalyptic number.

It is an amenable number.

857441894369 is a deficient number, since it is larger than the sum of its proper divisors (1).

857441894369 is an equidigital number, since it uses as much as digits as its factorization.

857441894369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 68.

The spelling of 857441894369 in words is "eight hundred fifty-seven billion, four hundred forty-one million, eight hundred ninety-four thousand, three hundred sixty-nine".