1263876387481 has 2 divisors, whose sum is σ = 1263876387482. Its totient is φ = 1263876387480.

The previous prime is 1263876387401. The next prime is 1263876387563. The reversal of 1263876387481 is 1847836783621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1249297998400 + 14578389081 = 1117720^2 + 120741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263876387481 - 2²⁵ = 1263842833049 is a prime.

It is a super-2 number, since 2×1263876387481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1263876387401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631938193740 + 631938193741.

It is an arithmetic number, because the mean of its divisors is an integer number (631938193741).

Almost surely, 2^{1263876387481} is an apocalyptic number.

It is an amenable number.

1263876387481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263876387481 is an equidigital number, since it uses as much as digits as its factorization.

1263876387481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65028096, while the sum is 64.

The spelling of 1263876387481 in words is "one trillion, two hundred sixty-three billion, eight hundred seventy-six million, three hundred eighty-seven thousand, four hundred eighty-one".