66021227513 has 2 divisors, whose sum is σ = 66021227514. Its totient is φ = 66021227512.

The previous prime is 66021227509. The next prime is 66021227677. The reversal of 66021227513 is 31572212066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40099261504 + 25921966009 = 200248^2 + 161003^2 .

It is a cyclic number.

It is not a de Polignac number, because 66021227513 - 2² = 66021227509 is a prime.

It is not a weakly prime, because it can be changed into another prime (66021229513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33010613756 + 33010613757.

It is an arithmetic number, because the mean of its divisors is an integer number (33010613757).

Almost surely, 2^66021227513 is an apocalyptic number.

It is an amenable number.

66021227513 is a deficient number, since it is larger than the sum of its proper divisors (1).

66021227513 is an equidigital number, since it uses as much as digits as its factorization.

66021227513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 66021227513 its reverse (31572212066), we get a palindrome (97593439579).

The spelling of 66021227513 in words is "sixty-six billion, twenty-one million, two hundred twenty-seven thousand, five hundred thirteen".