66306788760397 has 2 divisors, whose sum is σ = 66306788760398. Its totient is φ = 66306788760396.

The previous prime is 66306788760301. The next prime is 66306788760439. The reversal of 66306788760397 is 79306788760366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56544594708996 + 9762194051401 = 7519614^2 + 3124451^2 .

It is a cyclic number.

It is not a de Polignac number, because 66306788760397 - 2⁷ = 66306788760269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66306788760697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33153394380198 + 33153394380199.

It is an arithmetic number, because the mean of its divisors is an integer number (33153394380199).

Almost surely, 2^{66306788760397} is an apocalyptic number.

It is an amenable number.

66306788760397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66306788760397 is an equidigital number, since it uses as much as digits as its factorization.

66306788760397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304433152, while the sum is 76.

The spelling of 66306788760397 in words is "sixty-six trillion, three hundred six billion, seven hundred eighty-eight million, seven hundred sixty thousand, three hundred ninety-seven".