66200861 has 2 divisors, whose sum is σ = 66200862. Its totient is φ = 66200860.

The previous prime is 66200837. The next prime is 66200867. The reversal of 66200861 is 16800266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61387225 + 4813636 = 7835^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 66200861 - 2¹⁴ = 66184477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66200867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33100430 + 33100431.

It is an arithmetic number, because the mean of its divisors is an integer number (33100431).

Almost surely, 2^66200861 is an apocalyptic number.

It is an amenable number.

66200861 is a deficient number, since it is larger than the sum of its proper divisors (1).

66200861 is an equidigital number, since it uses as much as digits as its factorization.

66200861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 66200861 is about 8136.3911533308. The cubic root of 66200861 is about 404.5335502666.

The spelling of 66200861 in words is "sixty-six million, two hundred thousand, eight hundred sixty-one".