66555066001 has 2 divisors, whose sum is σ = 66555066002. Its totient is φ = 66555066000.

The previous prime is 66555065999. The next prime is 66555066023. The reversal of 66555066001 is 10066055566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58587718401 + 7967347600 = 242049^2 + 89260^2 .

It is a cyclic number.

It is not a de Polignac number, because 66555066001 - 2¹ = 66555065999 is a prime.

It is a super-2 number, since 2×66555066001² (a number of 22 digits) contains 22 as substring.

Together with 66555065999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66555066701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33277533000 + 33277533001.

It is an arithmetic number, because the mean of its divisors is an integer number (33277533001).

Almost surely, 2^66555066001 is an apocalyptic number.

It is an amenable number.

66555066001 is a deficient number, since it is larger than the sum of its proper divisors (1).

66555066001 is an equidigital number, since it uses as much as digits as its factorization.

66555066001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 66555066001 in words is "sixty-six billion, five hundred fifty-five million, sixty-six thousand, one".