1312123551563 has 16 divisors (see below), whose sum is σ = 1434993331200. Its totient is φ = 1189852649280.

The previous prime is 1312123551551. The next prime is 1312123551569. The reversal of 1312123551563 is 3651553212131.

It is a cyclic number.

It is not a de Polignac number, because 1312123551563 - 2⁶ = 1312123551499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312123551569) 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 15 ways as a sum of consecutive naturals, for example, 23068703 + ... + 23125511.

It is an arithmetic number, because the mean of its divisors is an integer number (89687083200).

Almost surely, 2^{1312123551563} is an apocalyptic number.

1312123551563 is a deficient number, since it is larger than the sum of its proper divisors (122869779637).

1312123551563 is a wasteful number, since it uses less digits than its factorization.

1312123551563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62042.

The product of its digits is 81000, while the sum is 38.

Adding to 1312123551563 its reverse (3651553212131), we get a palindrome (4963676763694).

The spelling of 1312123551563 in words is "one trillion, three hundred twelve billion, one hundred twenty-three million, five hundred fifty-one thousand, five hundred sixty-three".