12516263653 has 4 divisors (see below), whose sum is σ = 12525461388. Its totient is φ = 12507065920.

The previous prime is 12516263633. The next prime is 12516263741. The reversal of 12516263653 is 35636261521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35636261521 = 7 ⋅5090894503.

It can be written as a sum of positive squares in 2 ways, for example, as 3856658404 + 8659605249 = 62102^2 + 93057^2 .

It is a cyclic number.

It is not a de Polignac number, because 12516263653 - 2⁵ = 12516263621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12516263633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4596826 + ... + 4599547.

It is an arithmetic number, because the mean of its divisors is an integer number (3131365347).

Almost surely, 2^12516263653 is an apocalyptic number.

It is an amenable number.

12516263653 is a deficient number, since it is larger than the sum of its proper divisors (9197735).

12516263653 is an equidigital number, since it uses as much as digits as its factorization.

12516263653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9197734.

The product of its digits is 194400, while the sum is 40.

The spelling of 12516263653 in words is "twelve billion, five hundred sixteen million, two hundred sixty-three thousand, six hundred fifty-three".