66644266229 has 2 divisors, whose sum is σ = 66644266230. Its totient is φ = 66644266228.

The previous prime is 66644266223. The next prime is 66644266243. The reversal of 66644266229 is 92266244666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60859903204 + 5784363025 = 246698^2 + 76055^2 .

It is a cyclic number.

It is not a de Polignac number, because 66644266229 - 2²⁴ = 66627489013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66644266223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322133114 + 33322133115.

It is an arithmetic number, because the mean of its divisors is an integer number (33322133115).

Almost surely, 2^66644266229 is an apocalyptic number.

It is an amenable number.

66644266229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644266229 is an equidigital number, since it uses as much as digits as its factorization.

66644266229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 53.

The spelling of 66644266229 in words is "sixty-six billion, six hundred forty-four million, two hundred sixty-six thousand, two hundred twenty-nine".