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666557 is a prime number
BaseRepresentation
bin10100010101110111101
31020212100022
42202232331
5132312212
622141525
75444213
oct2425675
91225308
10666557
11415881
122818a5
131a4518
14134cb3
15d2772
hexa2bbd

666557 has 2 divisors, whose sum is σ = 666558. Its totient is φ = 666556.

The previous prime is 666541. The next prime is 666559. The reversal of 666557 is 755666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657721 + 8836 = 811^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 666557 - 24 = 666541 is a prime.

Together with 666559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333278 + 333279.

It is an arithmetic number, because the mean of its divisors is an integer number (333279).

2666557 is an apocalyptic number.

It is an amenable number.

666557 is a deficient number, since it is larger than the sum of its proper divisors (1).

666557 is an equidigital number, since it uses as much as digits as its factorization.

666557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 666557 is about 816.4294213219. The cubic root of 666557 is about 87.3532560781.

The spelling of 666557 in words is "six hundred sixty-six thousand, five hundred fifty-seven".