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666871 is a prime number
BaseRepresentation
bin10100010110011110111
31020212202221
42202303313
5132314441
622143211
75445142
oct2426367
91225687
10666871
11416037
12281b07
131a46ca
14135059
15d28d1
hexa2cf7

666871 has 2 divisors, whose sum is σ = 666872. Its totient is φ = 666870.

The previous prime is 666857. The next prime is 666889. The reversal of 666871 is 178666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666871 - 215 = 634103 is a prime.

666871 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333435 + 333436.

It is an arithmetic number, because the mean of its divisors is an integer number (333436).

2666871 is an apocalyptic number.

666871 is a deficient number, since it is larger than the sum of its proper divisors (1).

666871 is an equidigital number, since it uses as much as digits as its factorization.

666871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 666871 is about 816.6216994423. The cubic root of 666871 is about 87.3669706424.

The spelling of 666871 in words is "six hundred sixty-six thousand, eight hundred seventy-one".