166994563 has 2 divisors, whose sum is σ = 166994564. Its totient is φ = 166994562.

The previous prime is 166994549. The next prime is 166994617. The reversal of 166994563 is 365499661.

It is a weak prime.

It is an emirp because it is prime and its reverse (365499661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166994563 is a prime.

It is not a weakly prime, because it can be changed into another prime (166994533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83497281 + 83497282.

It is an arithmetic number, because the mean of its divisors is an integer number (83497282).

Almost surely, 2^166994563 is an apocalyptic number.

166994563 is a deficient number, since it is larger than the sum of its proper divisors (1).

166994563 is an equidigital number, since it uses as much as digits as its factorization.

166994563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The square root of 166994563 is about 12922.6376177621. The cubic root of 166994563 is about 550.6818683467.

The spelling of 166994563 in words is "one hundred sixty-six million, nine hundred ninety-four thousand, five hundred sixty-three".