857635536749 has 2 divisors, whose sum is σ = 857635536750. Its totient is φ = 857635536748.

The previous prime is 857635536707. The next prime is 857635536817. The reversal of 857635536749 is 947635536758.

It is an a-pointer prime, because the next prime (857635536817) can be obtained adding 857635536749 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., 856198596100 + 1436940649 = 925310^2 + 37907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857635536749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857635535749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428817768374 + 428817768375.

It is an arithmetic number, because the mean of its divisors is an integer number (428817768375).

Almost surely, 2^857635536749 is an apocalyptic number.

It is an amenable number.

857635536749 is a deficient number, since it is larger than the sum of its proper divisors (1).

857635536749 is an equidigital number, since it uses as much as digits as its factorization.

857635536749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536000, while the sum is 68.

Subtracting 857635536749 from its reverse (947635536758), we obtain a palindrome (90000000009).

The spelling of 857635536749 in words is "eight hundred fifty-seven billion, six hundred thirty-five million, five hundred thirty-six thousand, seven hundred forty-nine".