66665015201 has 2 divisors, whose sum is σ = 66665015202. Its totient is φ = 66665015200.

The previous prime is 66665015189. The next prime is 66665015233. The reversal of 66665015201 is 10251056666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53106741601 + 13558273600 = 230449^2 + 116440^2 .

It is a cyclic number.

It is not a de Polignac number, because 66665015201 - 2³⁴ = 49485146017 is a prime.

It is a super-2 number, since 2×66665015201² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66665015701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332507600 + 33332507601.

It is an arithmetic number, because the mean of its divisors is an integer number (33332507601).

Almost surely, 2^66665015201 is an apocalyptic number.

It is an amenable number.

66665015201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66665015201 is an equidigital number, since it uses as much as digits as its factorization.

66665015201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 66665015201 in words is "sixty-six billion, six hundred sixty-five million, fifteen thousand, two hundred one".