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BaseRepresentation
bin10011111000101…
…11100001101101
3102121220022221122
421330113201231
5320201214244
624315310325
74063642352
oct1174274155
9377808848
10166819949
118619032a
1247a4b3a5
132873aa3a
1418226629
15e9a31ee
hex9f1786d

166819949 has 2 divisors, whose sum is σ = 166819950. Its totient is φ = 166819948.

The previous prime is 166819889. The next prime is 166819999. The reversal of 166819949 is 949918661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150675625 + 16144324 = 12275^2 + 4018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-166819949 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166819949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166819999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83409974 + 83409975.

It is an arithmetic number, because the mean of its divisors is an integer number (83409975).

Almost surely, 2166819949 is an apocalyptic number.

It is an amenable number.

166819949 is a deficient number, since it is larger than the sum of its proper divisors (1).

166819949 is an equidigital number, since it uses as much as digits as its factorization.

166819949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 53.

The square root of 166819949 is about 12915.8797222644. The cubic root of 166819949 is about 550.4898654930.

The spelling of 166819949 in words is "one hundred sixty-six million, eight hundred nineteen thousand, nine hundred forty-nine".