645363050249 has 2 divisors, whose sum is σ = 645363050250. Its totient is φ = 645363050248.

The previous prime is 645363050243. The next prime is 645363050287. The reversal of 645363050249 is 942050363546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645342302224 + 20748025 = 803332^2 + 4555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645363050249 is a prime.

It is not a weakly prime, because it can be changed into another prime (645363050243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322681525124 + 322681525125.

It is an arithmetic number, because the mean of its divisors is an integer number (322681525125).

Almost surely, 2^645363050249 is an apocalyptic number.

It is an amenable number.

645363050249 is a deficient number, since it is larger than the sum of its proper divisors (1).

645363050249 is an equidigital number, since it uses as much as digits as its factorization.

645363050249 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 47.

The spelling of 645363050249 in words is "six hundred forty-five billion, three hundred sixty-three million, fifty thousand, two hundred forty-nine".