168564457 has 2 divisors, whose sum is σ = 168564458. Its totient is φ = 168564456.

The previous prime is 168564421. The next prime is 168564481. The reversal of 168564457 is 754465861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110439081 + 58125376 = 10509^2 + 7624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168564457 is a prime.

It is not a weakly prime, because it can be changed into another prime (168564497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84282228 + 84282229.

It is an arithmetic number, because the mean of its divisors is an integer number (84282229).

Almost surely, 2^168564457 is an apocalyptic number.

It is an amenable number.

168564457 is a deficient number, since it is larger than the sum of its proper divisors (1).

168564457 is an equidigital number, since it uses as much as digits as its factorization.

168564457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 46.

The square root of 168564457 is about 12983.2375392273. The cubic root of 168564457 is about 552.4021182976.

The spelling of 168564457 in words is "one hundred sixty-eight million, five hundred sixty-four thousand, four hundred fifty-seven".