166537888735643 has 2 divisors, whose sum is σ = 166537888735644. Its totient is φ = 166537888735642.

The previous prime is 166537888735637. The next prime is 166537888735663. The reversal of 166537888735643 is 346537888735661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166537888735643 is a prime.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83268944367821 + 83268944367822.

It is an arithmetic number, because the mean of its divisors is an integer number (83268944367822).

Almost surely, 2^{166537888735643} is an apocalyptic number.

166537888735643 is a deficient number, since it is larger than the sum of its proper divisors (1).

166537888735643 is an equidigital number, since it uses as much as digits as its factorization.

166537888735643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14631321600, while the sum is 80.

The spelling of 166537888735643 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 forty-three".