166805827 has 2 divisors, whose sum is σ = 166805828. Its totient is φ = 166805826.

The previous prime is 166805809. The next prime is 166805833. The reversal of 166805827 is 728508661.

It is a strong prime.

It is an emirp because it is prime and its reverse (728508661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166805827 is a prime.

It is not a weakly prime, because it can be changed into another prime (166805027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83402913 + 83402914.

It is an arithmetic number, because the mean of its divisors is an integer number (83402914).

Almost surely, 2^166805827 is an apocalyptic number.

166805827 is a deficient number, since it is larger than the sum of its proper divisors (1).

166805827 is an equidigital number, since it uses as much as digits as its factorization.

166805827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 166805827 is about 12915.3330193224. Note that the first 3 decimals coincide. The cubic root of 166805827 is about 550.4743313052.

The spelling of 166805827 in words is "one hundred sixty-six million, eight hundred five thousand, eight hundred twenty-seven".