66635256654251 has 2 divisors, whose sum is σ = 66635256654252. Its totient is φ = 66635256654250.

The previous prime is 66635256654233. The next prime is 66635256654257. The reversal of 66635256654251 is 15245665253666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66635256654251 - 2¹⁰ = 66635256653227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66635256654257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33317628327125 + 33317628327126.

It is an arithmetic number, because the mean of its divisors is an integer number (33317628327126).

Almost surely, 2^{66635256654251} is an apocalyptic number.

66635256654251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66635256654251 is an equidigital number, since it uses as much as digits as its factorization.

66635256654251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280000, while the sum is 62.

The spelling of 66635256654251 in words is "sixty-six trillion, six hundred thirty-five billion, two hundred fifty-six million, six hundred fifty-four thousand, two hundred fifty-one".