12345654320 has 320 divisors, whose sum is σ = 33657845760. Its totient is φ = 4180377600.

The previous prime is 12345654311. The next prime is 12345654341. The reversal of 12345654320 is 2345654321.

It is a Cunningham number, because it is equal to 111111²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45555785 + ... + 45556055.

It is an arithmetic number, because the mean of its divisors is an integer number (105180768).

Almost surely, 2^12345654320 is an apocalyptic number.

12345654320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12345654320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16828922880).

12345654320 is an abundant number, since it is smaller than the sum of its proper divisors (21312191440).

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

12345654320 is a wasteful number, since it uses less digits than its factorization.

12345654320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Subtracting from 12345654320 its reverse (2345654321), we obtain a palindrome (9999999999).

The spelling of 12345654320 in words is "twelve billion, three hundred forty-five million, six hundred fifty-four thousand, three hundred twenty".