166601893 has 2 divisors, whose sum is σ = 166601894. Its totient is φ = 166601892.

The previous prime is 166601891. The next prime is 166601917. The reversal of 166601893 is 398106661.

166601893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88491649 + 78110244 = 9407^2 + 8838^2 .

It is a cyclic number.

It is not a de Polignac number, because 166601893 - 2¹ = 166601891 is a prime.

Together with 166601891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166601891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83300946 + 83300947.

It is an arithmetic number, because the mean of its divisors is an integer number (83300947).

Almost surely, 2^166601893 is an apocalyptic number.

It is an amenable number.

166601893 is a deficient number, since it is larger than the sum of its proper divisors (1).

166601893 is an equidigital number, since it uses as much as digits as its factorization.

166601893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 166601893 is about 12907.4355702440. The cubic root of 166601893 is about 550.2499062663.

The spelling of 166601893 in words is "one hundred sixty-six million, six hundred one thousand, eight hundred ninety-three".