66654349441 has 2 divisors, whose sum is σ = 66654349442. Its totient is φ = 66654349440.

The previous prime is 66654349379. The next prime is 66654349459. The reversal of 66654349441 is 14494345666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66556260225 + 98089216 = 257985^2 + 9904^2 .

It is a cyclic number.

It is not a de Polignac number, because 66654349441 - 2⁷ = 66654349313 is a prime.

It is not a weakly prime, because it can be changed into another prime (66654389441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327174720 + 33327174721.

It is an arithmetic number, because the mean of its divisors is an integer number (33327174721).

Almost surely, 2^66654349441 is an apocalyptic number.

It is an amenable number.

66654349441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66654349441 is an equidigital number, since it uses as much as digits as its factorization.

66654349441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 52.

The spelling of 66654349441 in words is "sixty-six billion, six hundred fifty-four million, three hundred forty-nine thousand, four hundred forty-one".