166604563 has 2 divisors, whose sum is σ = 166604564. Its totient is φ = 166604562.

The previous prime is 166604561. The next prime is 166604609. The reversal of 166604563 is 365406661.

It is a weak prime.

It is an emirp because it is prime and its reverse (365406661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166604563 - 2¹ = 166604561 is a prime.

Together with 166604561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166604561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83302281 + 83302282.

It is an arithmetic number, because the mean of its divisors is an integer number (83302282).

Almost surely, 2^166604563 is an apocalyptic number.

166604563 is a deficient number, since it is larger than the sum of its proper divisors (1).

166604563 is an equidigital number, since it uses as much as digits as its factorization.

166604563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 166604563 is about 12907.5389985853. The cubic root of 166604563 is about 550.2528457275.

The spelling of 166604563 in words is "one hundred sixty-six million, six hundred four thousand, five hundred sixty-three".