12515356465 has 4 divisors (see below), whose sum is σ = 15018427764. Its totient is φ = 10012285168.

The previous prime is 12515356457. The next prime is 12515356481. The reversal of 12515356465 is 56465351521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56465351521 = 64283 ⋅878387.

It can be written as a sum of positive squares in 2 ways, for example, as 3785817841 + 8729538624 = 61529^2 + 93432^2 .

It is a cyclic number.

It is not a de Polignac number, because 12515356465 - 2³ = 12515356457 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, 1251535642 + ... + 1251535651.

It is an arithmetic number, because the mean of its divisors is an integer number (3754606941).

Almost surely, 2^12515356465 is an apocalyptic number.

It is an amenable number.

12515356465 is a deficient number, since it is larger than the sum of its proper divisors (2503071299).

12515356465 is an equidigital number, since it uses as much as digits as its factorization.

12515356465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503071298.

The product of its digits is 540000, while the sum is 43.

The spelling of 12515356465 in words is "twelve billion, five hundred fifteen million, three hundred fifty-six thousand, four hundred sixty-five".