1306261205357 has 2 divisors, whose sum is σ = 1306261205358. Its totient is φ = 1306261205356.

The previous prime is 1306261205299. The next prime is 1306261205387. The reversal of 1306261205357 is 7535021626031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1023427629316 + 282833576041 = 1011646^2 + 531821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306261205357 - 2⁸ = 1306261205101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306261205387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653130602678 + 653130602679.

It is an arithmetic number, because the mean of its divisors is an integer number (653130602679).

Almost surely, 2^{1306261205357} is an apocalyptic number.

It is an amenable number.

1306261205357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306261205357 is an equidigital number, since it uses as much as digits as its factorization.

1306261205357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 1306261205357 in words is "one trillion, three hundred six billion, two hundred sixty-one million, two hundred five thousand, three hundred fifty-seven".