645960468313 has 2 divisors, whose sum is σ = 645960468314. Its totient is φ = 645960468312.

The previous prime is 645960468281. The next prime is 645960468337. The reversal of 645960468313 is 313864069546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433243036944 + 212717431369 = 658212^2 + 461213^2 .

It is a cyclic number.

It is not a de Polignac number, because 645960468313 - 2⁵ = 645960468281 is a prime.

It is not a weakly prime, because it can be changed into another prime (645960462313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322980234156 + 322980234157.

It is an arithmetic number, because the mean of its divisors is an integer number (322980234157).

Almost surely, 2^645960468313 is an apocalyptic number.

It is an amenable number.

645960468313 is a deficient number, since it is larger than the sum of its proper divisors (1).

645960468313 is an equidigital number, since it uses as much as digits as its factorization.

645960468313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11197440, while the sum is 55.

The spelling of 645960468313 in words is "six hundred forty-five billion, nine hundred sixty million, four hundred sixty-eight thousand, three hundred thirteen".