12126316465 has 4 divisors (see below), whose sum is σ = 14551579764. Its totient is φ = 9701053168.

The previous prime is 12126316459. The next prime is 12126316487. The reversal of 12126316465 is 56461362121.

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 3318681664 + 8807634801 = 57608^2 + 93849^2 .

It is a cyclic number.

It is not a de Polignac number, because 12126316465 - 2³ = 12126316457 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, 1212631642 + ... + 1212631651.

It is an arithmetic number, because the mean of its divisors is an integer number (3637894941).

Almost surely, 2^12126316465 is an apocalyptic number.

It is an amenable number.

12126316465 is a deficient number, since it is larger than the sum of its proper divisors (2425263299).

12126316465 is an equidigital number, since it uses as much as digits as its factorization.

12126316465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425263298.

The product of its digits is 51840, while the sum is 37.

Adding to 12126316465 its reverse (56461362121), we get a palindrome (68587678586).

The spelling of 12126316465 in words is "twelve billion, one hundred twenty-six million, three hundred sixteen thousand, four hundred sixty-five".