12739563505 has 4 divisors (see below), whose sum is σ = 15287476212. Its totient is φ = 10191650800.

The previous prime is 12739563467. The next prime is 12739563533. The reversal of 12739563505 is 50536593721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8246274481 + 4493289024 = 90809^2 + 67032^2 .

It is not a de Polignac number, because 12739563505 - 2⁹ = 12739562993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273956346 + ... + 1273956355.

It is an arithmetic number, because the mean of its divisors is an integer number (3821869053).

Almost surely, 2^12739563505 is an apocalyptic number.

It is an amenable number.

12739563505 is a deficient number, since it is larger than the sum of its proper divisors (2547912707).

12739563505 is an equidigital number, since it uses as much as digits as its factorization.

12739563505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547912706.

The product of its (nonzero) digits is 850500, while the sum is 46.

The spelling of 12739563505 in words is "twelve billion, seven hundred thirty-nine million, five hundred sixty-three thousand, five hundred five".