66666624229 has 2 divisors, whose sum is σ = 66666624230. Its totient is φ = 66666624228.

The previous prime is 66666624191. The next prime is 66666624247. The reversal of 66666624229 is 92242666666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33856736004 + 32809888225 = 184002^2 + 181135^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666624229 - 2¹⁵ = 66666591461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66666624229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66666624289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333312114 + 33333312115.

It is an arithmetic number, because the mean of its divisors is an integer number (33333312115).

Almost surely, 2^66666624229 is an apocalyptic number.

It is an amenable number.

66666624229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666624229 is an equidigital number, since it uses as much as digits as its factorization.

66666624229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 55.

The spelling of 66666624229 in words is "sixty-six billion, six hundred sixty-six million, six hundred twenty-four thousand, two hundred twenty-nine".