1243642225320 has 288 divisors, whose sum is σ = 4607228676960. Its totient is φ = 301488739200.

The previous prime is 1243642225307. The next prime is 1243642225321. The reversal of 1243642225320 is 235222463421.

1243642225320 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 642 + 2 + 2 + 5 + 3 + 2 + 0 = 666.

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 (1243642225321) 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, 647415 + ... + 1704825.

It is an arithmetic number, because the mean of its divisors is an integer number (15997321795).

Almost surely, 2^{1243642225320} is an apocalyptic number.

1243642225320 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 1243642225320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2303614338480).

1243642225320 is an abundant number, since it is smaller than the sum of its proper divisors (3363586451640).

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

1243642225320 is a wasteful number, since it uses less digits than its factorization.

1243642225320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057459 (or 1057432 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 1243642225320 its reverse (235222463421), we get a palindrome (1478864688741).

The spelling of 1243642225320 in words is "one trillion, two hundred forty-three billion, six hundred forty-two million, two hundred twenty-five thousand, three hundred twenty".