645350053549 has 2 divisors, whose sum is σ = 645350053550. Its totient is φ = 645350053548.

The previous prime is 645350053463. The next prime is 645350053619. The reversal of 645350053549 is 945350053546.

645350053549 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., 586710040900 + 58640012649 = 765970^2 + 242157^2 .

It is a cyclic number.

It is not a de Polignac number, because 645350053549 - 2³¹ = 643202569901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645350053349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322675026774 + 322675026775.

It is an arithmetic number, because the mean of its divisors is an integer number (322675026775).

Almost surely, 2^645350053549 is an apocalyptic number.

It is an amenable number.

645350053549 is a deficient number, since it is larger than the sum of its proper divisors (1).

645350053549 is an equidigital number, since it uses as much as digits as its factorization.

645350053549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860000, while the sum is 49.

The spelling of 645350053549 in words is "six hundred forty-five billion, three hundred fifty million, fifty-three thousand, five hundred forty-nine".