1245345221317 has 2 divisors, whose sum is σ = 1245345221318. Its totient is φ = 1245345221316.

The previous prime is 1245345221311. The next prime is 1245345221347. The reversal of 1245345221317 is 7131225435421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1229013914881 + 16331306436 = 1108609^2 + 127794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245345221317 is a prime.

It is a super-2 number, since 2×1245345221317² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1245345221317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245345221311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622672610658 + 622672610659.

It is an arithmetic number, because the mean of its divisors is an integer number (622672610659).

Almost surely, 2^{1245345221317} is an apocalyptic number.

It is an amenable number.

1245345221317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245345221317 is an equidigital number, since it uses as much as digits as its factorization.

1245345221317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 40.

The spelling of 1245345221317 in words is "one trillion, two hundred forty-five billion, three hundred forty-five million, two hundred twenty-one thousand, three hundred seventeen".