170606209861 has 2 divisors, whose sum is σ = 170606209862. Its totient is φ = 170606209860.

The previous prime is 170606209843. The next prime is 170606209889. The reversal of 170606209861 is 168902606071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129996302500 + 40609907361 = 360550^2 + 201519^2 .

It is a cyclic number.

It is not a de Polignac number, because 170606209861 - 2¹¹ = 170606207813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170606209811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85303104930 + 85303104931.

It is an arithmetic number, because the mean of its divisors is an integer number (85303104931).

Almost surely, 2^170606209861 is an apocalyptic number.

It is an amenable number.

170606209861 is a deficient number, since it is larger than the sum of its proper divisors (1).

170606209861 is an equidigital number, since it uses as much as digits as its factorization.

170606209861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 170606209861 in words is "one hundred seventy billion, six hundred six million, two hundred nine thousand, eight hundred sixty-one".