66265554989 has 2 divisors, whose sum is σ = 66265554990. Its totient is φ = 66265554988.

The previous prime is 66265554977. The next prime is 66265555003. The reversal of 66265554989 is 98945556266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50497730089 + 15767824900 = 224717^2 + 125570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66265554989 is a prime.

It is a super-2 number, since 2×66265554989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66265574989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33132777494 + 33132777495.

It is an arithmetic number, because the mean of its divisors is an integer number (33132777495).

Almost surely, 2^66265554989 is an apocalyptic number.

It is an amenable number.

66265554989 is a deficient number, since it is larger than the sum of its proper divisors (1).

66265554989 is an equidigital number, since it uses as much as digits as its factorization.

66265554989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968000, while the sum is 65.

The spelling of 66265554989 in words is "sixty-six billion, two hundred sixty-five million, five hundred fifty-four thousand, nine hundred eighty-nine".