12545621317 has 2 divisors, whose sum is σ = 12545621318. Its totient is φ = 12545621316.

The previous prime is 12545621273. The next prime is 12545621399. The reversal of 12545621317 is 71312654521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10865769121 + 1679852196 = 104239^2 + 40986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12545621317 is a prime.

It is a super-2 number, since 2×12545621317² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12545621617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6272810658 + 6272810659.

It is an arithmetic number, because the mean of its divisors is an integer number (6272810659).

Almost surely, 2^12545621317 is an apocalyptic number.

It is an amenable number.

12545621317 is a deficient number, since it is larger than the sum of its proper divisors (1).

12545621317 is an equidigital number, since it uses as much as digits as its factorization.

12545621317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The spelling of 12545621317 in words is "twelve billion, five hundred forty-five million, six hundred twenty-one thousand, three hundred seventeen".