166816544407 has 2 divisors, whose sum is σ = 166816544408. Its totient is φ = 166816544406.

The previous prime is 166816544393. The next prime is 166816544437. The reversal of 166816544407 is 704445618661.

It is a weak prime.

It is an emirp because it is prime and its reverse (704445618661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166816544407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166816544437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83408272203 + 83408272204.

It is an arithmetic number, because the mean of its divisors is an integer number (83408272204).

Almost surely, 2^166816544407 is an apocalyptic number.

166816544407 is a deficient number, since it is larger than the sum of its proper divisors (1).

166816544407 is an equidigital number, since it uses as much as digits as its factorization.

166816544407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 166816544407 in words is "one hundred sixty-six billion, eight hundred sixteen million, five hundred forty-four thousand, four hundred seven".