645302242213 has 4 divisors (see below), whose sum is σ = 651222446380. Its totient is φ = 639382038048.

The previous prime is 645302242177. The next prime is 645302242223. The reversal of 645302242213 is 312242203546.

645302242213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 409167474244 + 236134767969 = 639662^2 + 485937^2 .

It is a cyclic number.

It is not a de Polignac number, because 645302242213 - 2²⁵ = 645268687781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645302242223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2960101920 + ... + 2960102137.

It is an arithmetic number, because the mean of its divisors is an integer number (162805611595).

Almost surely, 2^645302242213 is an apocalyptic number.

It is an amenable number.

645302242213 is a deficient number, since it is larger than the sum of its proper divisors (5920204167).

645302242213 is a wasteful number, since it uses less digits than its factorization.

645302242213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5920204166.

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 645302242213 its reverse (312242203546), we get a palindrome (957544445759).

The spelling of 645302242213 in words is "six hundred forty-five billion, three hundred two million, two hundred forty-two thousand, two hundred thirteen".