168635769857 has 2 divisors, whose sum is σ = 168635769858. Its totient is φ = 168635769856.

The previous prime is 168635769823. The next prime is 168635769889. The reversal of 168635769857 is 758967536861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131385225841 + 37250544016 = 362471^2 + 193004^2 .

It is a cyclic number.

It is not a de Polignac number, because 168635769857 - 2³⁶ = 99916293121 is a prime.

It is not a weakly prime, because it can be changed into another prime (168635769817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84317884928 + 84317884929.

It is an arithmetic number, because the mean of its divisors is an integer number (84317884929).

Almost surely, 2^168635769857 is an apocalyptic number.

It is an amenable number.

168635769857 is a deficient number, since it is larger than the sum of its proper divisors (1).

168635769857 is an equidigital number, since it uses as much as digits as its factorization.

168635769857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 457228800, while the sum is 71.

The spelling of 168635769857 in words is "one hundred sixty-eight billion, six hundred thirty-five million, seven hundred sixty-nine thousand, eight hundred fifty-seven".