1263876387523 has 4 divisors (see below), whose sum is σ = 1263963272400. Its totient is φ = 1263789502648.

The previous prime is 1263876387481. The next prime is 1263876387563. The reversal of 1263876387523 is 3257836783621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1263876387523 - 2²⁵ = 1263842833091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263876387563) 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 in 3 ways as a sum of consecutive naturals, for example, 43420615 + ... + 43449712.

It is an arithmetic number, because the mean of its divisors is an integer number (315990818100).

Almost surely, 2^{1263876387523} is an apocalyptic number.

1263876387523 is a deficient number, since it is larger than the sum of its proper divisors (86884877).

1263876387523 is an equidigital number, since it uses as much as digits as its factorization.

1263876387523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86884876.

The product of its digits is 60963840, while the sum is 61.

The spelling of 1263876387523 in words is "one trillion, two hundred sixty-three billion, eight hundred seventy-six million, three hundred eighty-seven thousand, five hundred twenty-three".