168609577 has 2 divisors, whose sum is σ = 168609578. Its totient is φ = 168609576.

The previous prime is 168609569. The next prime is 168609601. The reversal of 168609577 is 775906861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149108521 + 19501056 = 12211^2 + 4416^2 .

It is a cyclic number.

It is not a de Polignac number, because 168609577 - 2³ = 168609569 is a prime.

It is a super-2 number, since 2×168609577² = 56858378912237858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168609577.

It is not a weakly prime, because it can be changed into another prime (168609517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84304788 + 84304789.

It is an arithmetic number, because the mean of its divisors is an integer number (84304789).

Almost surely, 2^168609577 is an apocalyptic number.

It is an amenable number.

168609577 is a deficient number, since it is larger than the sum of its proper divisors (1).

168609577 is an equidigital number, since it uses as much as digits as its factorization.

168609577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 168609577 is about 12984.9750481085. The cubic root of 168609577 is about 552.4514014432.

The spelling of 168609577 in words is "one hundred sixty-eight million, six hundred nine thousand, five hundred seventy-seven".