66149688694289 has 2 divisors, whose sum is σ = 66149688694290. Its totient is φ = 66149688694288.

The previous prime is 66149688694171. The next prime is 66149688694301. The reversal of 66149688694289 is 98249688694166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48228927537025 + 17920761157264 = 6944705^2 + 4233292^2 .

It is a cyclic number.

It is not a de Polignac number, because 66149688694289 - 2³⁶ = 66080969217553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66149688694289.

It is not a weakly prime, because it can be changed into another prime (66149688694589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33074844347144 + 33074844347145.

It is an arithmetic number, because the mean of its divisors is an integer number (33074844347145).

Almost surely, 2^{66149688694289} is an apocalyptic number.

It is an amenable number.

66149688694289 is a deficient number, since it is larger than the sum of its proper divisors (1).

66149688694289 is an equidigital number, since it uses as much as digits as its factorization.

66149688694289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15479341056, while the sum is 86.

The spelling of 66149688694289 in words is "sixty-six trillion, one hundred forty-nine billion, six hundred eighty-eight million, six hundred ninety-four thousand, two hundred eighty-nine".