12553620565 has 8 divisors (see below), whose sum is σ = 15270706008. Its totient is φ = 9905322240.

The previous prime is 12553620559. The next prime is 12553620577. The reversal of 12553620565 is 56502635521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 378263601 + 12175356964 = 19449^2 + 110342^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12553620565 - 2¹⁹ = 12553096277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17196376 + ... + 17197105.

It is an arithmetic number, because the mean of its divisors is an integer number (1908838251).

Almost surely, 2^12553620565 is an apocalyptic number.

It is an amenable number.

12553620565 is a deficient number, since it is larger than the sum of its proper divisors (2717085443).

12553620565 is an equidigital number, since it uses as much as digits as its factorization.

12553620565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34393559.

The product of its (nonzero) digits is 270000, while the sum is 40.

The spelling of 12553620565 in words is "twelve billion, five hundred fifty-three million, six hundred twenty thousand, five hundred sixty-five".