245656721113 has 2 divisors, whose sum is σ = 245656721114. Its totient is φ = 245656721112.

The previous prime is 245656721111. The next prime is 245656721179. The reversal of 245656721113 is 311127656542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245547998784 + 108722329 = 495528^2 + 10427^2 .

It is a cyclic number.

It is not a de Polignac number, because 245656721113 - 2¹ = 245656721111 is a prime.

Together with 245656721111, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 245656721113.

It is not a weakly prime, because it can be changed into another prime (245656721111) 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, 122828360556 + 122828360557.

It is an arithmetic number, because the mean of its divisors is an integer number (122828360557).

Almost surely, 2^245656721113 is an apocalyptic number.

It is an amenable number.

245656721113 is a deficient number, since it is larger than the sum of its proper divisors (1).

245656721113 is an equidigital number, since it uses as much as digits as its factorization.

245656721113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The spelling of 245656721113 in words is "two hundred forty-five billion, six hundred fifty-six million, seven hundred twenty-one thousand, one hundred thirteen".