12356255520 has 432 divisors, whose sum is σ = 51940252728. Its totient is φ = 2657894400.

The previous prime is 12356255507. The next prime is 12356255521. The reversal of 12356255520 is 2555265321.

12356255520 is a `hidden beast` number, since 1 + 2 + 3 + 5 + 625 + 5 + 5 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12350321424 + 5934096 = 111132^2 + 2436^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12356255521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1194370 + ... + 1204670.

Almost surely, 2^12356255520 is an apocalyptic number.

12356255520 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 12356255520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25970126364).

12356255520 is an abundant number, since it is smaller than the sum of its proper divisors (39583997208).

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

12356255520 is a wasteful number, since it uses less digits than its factorization.

12356255520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10353 (or 10335 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 12356255520 in words is "twelve billion, three hundred fifty-six million, two hundred fifty-five thousand, five hundred twenty".