166537888735663 has 2 divisors, whose sum is σ = 166537888735664. Its totient is φ = 166537888735662.

The previous prime is 166537888735643. The next prime is 166537888735709. The reversal of 166537888735663 is 366537888735661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166537888735663 - 2³³ = 166529298801071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166537888735633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83268944367831 + 83268944367832.

It is an arithmetic number, because the mean of its divisors is an integer number (83268944367832).

Almost surely, 2^{166537888735663} is an apocalyptic number.

166537888735663 is a deficient number, since it is larger than the sum of its proper divisors (1).

166537888735663 is an equidigital number, since it uses as much as digits as its factorization.

166537888735663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21946982400, while the sum is 82.

The spelling of 166537888735663 in words is "one hundred sixty-six trillion, five hundred thirty-seven billion, eight hundred eighty-eight million, seven hundred thirty-five thousand, six hundred sixty-three".