Search a number
66541 is a prime number
BaseRepresentation
bin10000001111101101
310101021111
4100033231
54112131
61232021
7364666
oct201755
9111244
1066541
1145aa2
1232611
1324397
141a36d
1514ab1
hex103ed

66541 has 2 divisors, whose sum is σ = 66542. Its totient is φ = 66540.

The previous prime is 66533. The next prime is 66553. The reversal of 66541 is 14566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64516 + 2025 = 254^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 66541 - 23 = 66533 is a prime.

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33270 + 33271.

It is an arithmetic number, because the mean of its divisors is an integer number (33271).

266541 is an apocalyptic number.

It is an amenable number.

66541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66541 is an equidigital number, since it uses as much as digits as its factorization.

66541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 66541 is about 257.9554225055. The cubic root of 66541 is about 40.5225196102.

The spelling of 66541 in words is "sixty-six thousand, five hundred forty-one".