645565213333 has 2 divisors, whose sum is σ = 645565213334. Its totient is φ = 645565213332.

The previous prime is 645565213309. The next prime is 645565213387. The reversal of 645565213333 is 333312565546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339908822289 + 305656391044 = 583017^2 + 552862^2 .

It is a cyclic number.

It is not a de Polignac number, because 645565213333 - 2²⁹ = 645028342421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645535213333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322782606666 + 322782606667.

It is an arithmetic number, because the mean of its divisors is an integer number (322782606667).

Almost surely, 2^645565213333 is an apocalyptic number.

It is an amenable number.

645565213333 is a deficient number, since it is larger than the sum of its proper divisors (1).

645565213333 is an equidigital number, since it uses as much as digits as its factorization.

645565213333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916000, while the sum is 46.

Adding to 645565213333 its reverse (333312565546), we get a palindrome (978877778879).

It can be divided in two parts, 645565213 and 333, that added together give a palindrome (645565546).

The spelling of 645565213333 in words is "six hundred forty-five billion, five hundred sixty-five million, two hundred thirteen thousand, three hundred thirty-three".