645053263601 has 2 divisors, whose sum is σ = 645053263602. Its totient is φ = 645053263600.

The previous prime is 645053263597. The next prime is 645053263639. The reversal of 645053263601 is 106362350546.

645053263601 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., 613128150625 + 31925112976 = 783025^2 + 178676^2 .

It is a cyclic number.

It is not a de Polignac number, because 645053263601 - 2² = 645053263597 is a prime.

It is not a weakly prime, because it can be changed into another prime (645053263661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322526631800 + 322526631801.

It is an arithmetic number, because the mean of its divisors is an integer number (322526631801).

Almost surely, 2^645053263601 is an apocalyptic number.

It is an amenable number.

645053263601 is a deficient number, since it is larger than the sum of its proper divisors (1).

645053263601 is an equidigital number, since it uses as much as digits as its factorization.

645053263601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 645053263601 in words is "six hundred forty-five billion, fifty-three million, two hundred sixty-three thousand, six hundred one".