1263387495917 has 2 divisors, whose sum is σ = 1263387495918. Its totient is φ = 1263387495916.

The previous prime is 1263387495911. The next prime is 1263387495983. The reversal of 1263387495917 is 7195947833621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804978606436 + 458408889481 = 897206^2 + 677059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263387495917 - 2¹⁰ = 1263387494893 is a prime.

It is a super-2 number, since 2×1263387495917² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263387495911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631693747958 + 631693747959.

It is an arithmetic number, because the mean of its divisors is an integer number (631693747959).

Almost surely, 2^{1263387495917} is an apocalyptic number.

It is an amenable number.

1263387495917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263387495917 is an equidigital number, since it uses as much as digits as its factorization.

1263387495917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 65.

The spelling of 1263387495917 in words is "one trillion, two hundred sixty-three billion, three hundred eighty-seven million, four hundred ninety-five thousand, nine hundred seventeen".