166681585933 has 2 divisors, whose sum is σ = 166681585934. Its totient is φ = 166681585932.

The previous prime is 166681585883. The next prime is 166681585997. The reversal of 166681585933 is 339585186661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128019408804 + 38662177129 = 357798^2 + 196627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166681585933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166681583933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83340792966 + 83340792967.

It is an arithmetic number, because the mean of its divisors is an integer number (83340792967).

Almost surely, 2^166681585933 is an apocalyptic number.

It is an amenable number.

166681585933 is a deficient number, since it is larger than the sum of its proper divisors (1).

166681585933 is an equidigital number, since it uses as much as digits as its factorization.

166681585933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27993600, while the sum is 61.

The spelling of 166681585933 in words is "one hundred sixty-six billion, six hundred eighty-one million, five hundred eighty-five thousand, nine hundred thirty-three".