245974318217 has 2 divisors, whose sum is σ = 245974318218. Its totient is φ = 245974318216.

The previous prime is 245974318171. The next prime is 245974318229. The reversal of 245974318217 is 712813479542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241293158656 + 4681159561 = 491216^2 + 68419^2 .

It is a cyclic number.

It is not a de Polignac number, because 245974318217 - 2⁶ = 245974318153 is a prime.

It is not a weakly prime, because it can be changed into another prime (245974318267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122987159108 + 122987159109.

It is an arithmetic number, because the mean of its divisors is an integer number (122987159109).

Almost surely, 2^245974318217 is an apocalyptic number.

It is an amenable number.

245974318217 is a deficient number, since it is larger than the sum of its proper divisors (1).

245974318217 is an equidigital number, since it uses as much as digits as its factorization.

245974318217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 53.

The spelling of 245974318217 in words is "two hundred forty-five billion, nine hundred seventy-four million, three hundred eighteen thousand, two hundred seventeen".