245745207809 has 2 divisors, whose sum is σ = 245745207810. Its totient is φ = 245745207808.

The previous prime is 245745207751. The next prime is 245745207811. The reversal of 245745207809 is 908702547542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223634410000 + 22110797809 = 472900^2 + 148697^2 .

It is a cyclic number.

It is not a de Polignac number, because 245745207809 - 2⁸ = 245745207553 is a prime.

It is a super-2 number, since 2×245745207809² (a number of 24 digits) contains 22 as substring.

Together with 245745207811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245745207859) 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, 122872603904 + 122872603905.

It is an arithmetic number, because the mean of its divisors is an integer number (122872603905).

Almost surely, 2^245745207809 is an apocalyptic number.

It is an amenable number.

245745207809 is a deficient number, since it is larger than the sum of its proper divisors (1).

245745207809 is an equidigital number, since it uses as much as digits as its factorization.

245745207809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 245745207809 in words is "two hundred forty-five billion, seven hundred forty-five million, two hundred seven thousand, eight hundred nine".