66425240729 has 2 divisors, whose sum is σ = 66425240730. Its totient is φ = 66425240728.

The previous prime is 66425240723. The next prime is 66425240789. The reversal of 66425240729 is 92704252466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63881551504 + 2543689225 = 252748^2 + 50435^2 .

It is a cyclic number.

It is not a de Polignac number, because 66425240729 - 2³² = 62130273433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66425240723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33212620364 + 33212620365.

It is an arithmetic number, because the mean of its divisors is an integer number (33212620365).

Almost surely, 2^66425240729 is an apocalyptic number.

It is an amenable number.

66425240729 is a deficient number, since it is larger than the sum of its proper divisors (1).

66425240729 is an equidigital number, since it uses as much as digits as its factorization.

66425240729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 66425240729 in words is "sixty-six billion, four hundred twenty-five million, two hundred forty thousand, seven hundred twenty-nine".