66635125331 has 2 divisors, whose sum is σ = 66635125332. Its totient is φ = 66635125330.

The previous prime is 66635125327. The next prime is 66635125351. The reversal of 66635125331 is 13352153666.

66635125331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66635125331 - 2² = 66635125327 is a prime.

It is a super-2 number, since 2×66635125331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66635125351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33317562665 + 33317562666.

It is an arithmetic number, because the mean of its divisors is an integer number (33317562666).

Almost surely, 2^66635125331 is an apocalyptic number.

66635125331 is a deficient number, since it is larger than the sum of its proper divisors (1).

66635125331 is an equidigital number, since it uses as much as digits as its factorization.

66635125331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 41.

Adding to 66635125331 its reverse (13352153666), we get a palindrome (79987278997).

The spelling of 66635125331 in words is "sixty-six billion, six hundred thirty-five million, one hundred twenty-five thousand, three hundred thirty-one".