645302351389 has 2 divisors, whose sum is σ = 645302351390. Its totient is φ = 645302351388.

The previous prime is 645302351383. The next prime is 645302351443. The reversal of 645302351389 is 983153203546.

645302351389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644902151364 + 400200025 = 803058^2 + 20005^2 .

It is a cyclic number.

It is not a de Polignac number, because 645302351389 - 2⁷ = 645302351261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645302351383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322651175694 + 322651175695.

It is an arithmetic number, because the mean of its divisors is an integer number (322651175695).

Almost surely, 2^645302351389 is an apocalyptic number.

It is an amenable number.

645302351389 is a deficient number, since it is larger than the sum of its proper divisors (1).

645302351389 is an equidigital number, since it uses as much as digits as its factorization.

645302351389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 645302351389 in words is "six hundred forty-five billion, three hundred two million, three hundred fifty-one thousand, three hundred eighty-nine".