645233053709 has 2 divisors, whose sum is σ = 645233053710. Its totient is φ = 645233053708.

The previous prime is 645233053693. The next prime is 645233053723. The reversal of 645233053709 is 907350332546.

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., 641285444809 + 3947608900 = 800803^2 + 62830^2 .

It is a cyclic number.

It is not a de Polignac number, because 645233053709 - 2⁴ = 645233053693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645233053769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322616526854 + 322616526855.

It is an arithmetic number, because the mean of its divisors is an integer number (322616526855).

Almost surely, 2^645233053709 is an apocalyptic number.

It is an amenable number.

645233053709 is a deficient number, since it is larger than the sum of its proper divisors (1).

645233053709 is an equidigital number, since it uses as much as digits as its factorization.

645233053709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 47.

The spelling of 645233053709 in words is "six hundred forty-five billion, two hundred thirty-three million, fifty-three thousand, seven hundred nine".