12400177505 has 4 divisors (see below), whose sum is σ = 14880213012. Its totient is φ = 9920142000.

The previous prime is 12400177481. The next prime is 12400177513. The reversal of 12400177505 is 50577100421.

12400177505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50577100421 = 733 ⋅69000137.

It can be written as a sum of positive squares in 2 ways, for example, as 4449423616 + 7950753889 = 66704^2 + 89167^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12400177505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240017746 + ... + 1240017755.

It is an arithmetic number, because the mean of its divisors is an integer number (3720053253).

Almost surely, 2^12400177505 is an apocalyptic number.

It is an amenable number.

12400177505 is a deficient number, since it is larger than the sum of its proper divisors (2480035507).

12400177505 is an equidigital number, since it uses as much as digits as its factorization.

12400177505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480035506.

The product of its (nonzero) digits is 9800, while the sum is 32.

Adding to 12400177505 its reverse (50577100421), we get a palindrome (62977277926).

The spelling of 12400177505 in words is "twelve billion, four hundred million, one hundred seventy-seven thousand, five hundred five".