66366541 has 2 divisors, whose sum is σ = 66366542. Its totient is φ = 66366540.

The previous prime is 66366511. The next prime is 66366581. The reversal of 66366541 is 14566366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 594441 = 8110^2 + 771^2 .

It is a cyclic number.

It is not a de Polignac number, because 66366541 - 2⁹ = 66366029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66366541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66366511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33183270 + 33183271.

It is an arithmetic number, because the mean of its divisors is an integer number (33183271).

Almost surely, 2^66366541 is an apocalyptic number.

It is an amenable number.

66366541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66366541 is an equidigital number, since it uses as much as digits as its factorization.

66366541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 37.

The square root of 66366541 is about 8146.5662091460. The cubic root of 66366541 is about 404.8707426766.

The spelling of 66366541 in words is "sixty-six million, three hundred sixty-six thousand, five hundred forty-one".