13125443505 has 16 divisors (see below), whose sum is σ = 21344985024. Its totient is φ = 6885478080.

The previous prime is 13125443501. The next prime is 13125443533. The reversal of 13125443505 is 50534452131.

It is not a de Polignac number, because 13125443505 - 2² = 13125443501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13125443501) 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, 7171459 + ... + 7173288.

It is an arithmetic number, because the mean of its divisors is an integer number (1334061564).

Almost surely, 2^13125443505 is an apocalyptic number.

13125443505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13125443505 is a deficient number, since it is larger than the sum of its proper divisors (8219541519).

13125443505 is a wasteful number, since it uses less digits than its factorization.

13125443505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14344816.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 13125443505 its reverse (50534452131), we get a palindrome (63659895636).

The spelling of 13125443505 in words is "thirteen billion, one hundred twenty-five million, four hundred forty-three thousand, five hundred five".