66000049 has 2 divisors, whose sum is σ = 66000050. Its totient is φ = 66000048.

The previous prime is 66000047. The next prime is 66000071. The reversal of 66000049 is 94000066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 27373824 = 6215^2 + 5232^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000049 - 2¹ = 66000047 is a prime.

Together with 66000047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 65999987 and 66000032.

It is not a weakly prime, because it can be changed into another prime (66000043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000024 + 33000025.

It is an arithmetic number, because the mean of its divisors is an integer number (33000025).

Almost surely, 2^66000049 is an apocalyptic number.

It is an amenable number.

66000049 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000049 is an equidigital number, since it uses as much as digits as its factorization.

66000049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 66000049 is about 8124.0414203769. The cubic root of 66000049 is about 404.1241020727.

The spelling of 66000049 in words is "sixty-six million, forty-nine", and thus it is an aban number and an uban number.