645144642293 has 2 divisors, whose sum is σ = 645144642294. Its totient is φ = 645144642292.

The previous prime is 645144642169. The next prime is 645144642319. The reversal of 645144642293 is 392246441546.

645144642293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613029493444 + 32115148849 = 782962^2 + 179207^2 .

It is a cyclic number.

It is not a de Polignac number, because 645144642293 - 2¹⁶ = 645144576757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645144648293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322572321146 + 322572321147.

It is an arithmetic number, because the mean of its divisors is an integer number (322572321147).

Almost surely, 2^645144642293 is an apocalyptic number.

It is an amenable number.

645144642293 is a deficient number, since it is larger than the sum of its proper divisors (1).

645144642293 is an equidigital number, since it uses as much as digits as its factorization.

645144642293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 50.

The spelling of 645144642293 in words is "six hundred forty-five billion, one hundred forty-four million, six hundred forty-two thousand, two hundred ninety-three".