12505400320 has 88 divisors (see below), whose sum is σ = 34283876544. Its totient is φ = 4287553536.

The previous prime is 12505400293. The next prime is 12505400339. The reversal of 12505400320 is 2300450521.

It is a super-2 number, since 2×12505400320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12505400291 and 12505400300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138622 + ... + 210301.

Almost surely, 2^12505400320 is an apocalyptic number.

12505400320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12505400320 is an abundant number, since it is smaller than the sum of its proper divisors (21778476224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12505400320 is an equidigital number, since it uses as much as digits as its factorization.

12505400320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348955 (or 348937 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 12505400320 its reverse (2300450521), we get a palindrome (14805850841).

The spelling of 12505400320 in words is "twelve billion, five hundred five million, four hundred thousand, three hundred twenty".