66315289 has 2 divisors, whose sum is σ = 66315290. Its totient is φ = 66315288.

The previous prime is 66315259. The next prime is 66315313. The reversal of 66315289 is 98251366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39275289 + 27040000 = 6267^2 + 5200^2 .

It is a cyclic number.

It is not a de Polignac number, because 66315289 - 2⁹ = 66314777 is a prime.

It is not a weakly prime, because it can be changed into another prime (66315259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157644 + 33157645.

It is an arithmetic number, because the mean of its divisors is an integer number (33157645).

Almost surely, 2^66315289 is an apocalyptic number.

It is an amenable number.

66315289 is a deficient number, since it is larger than the sum of its proper divisors (1).

66315289 is an equidigital number, since it uses as much as digits as its factorization.

66315289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 66315289 is about 8143.4199818013. The cubic root of 66315289 is about 404.7664944674.

The spelling of 66315289 in words is "sixty-six million, three hundred fifteen thousand, two hundred eighty-nine".