1556421210240 has 768 divisors, whose sum is σ = 5470422220800. Its totient is φ = 376187535360.

The previous prime is 1556421210221. The next prime is 1556421210241. The reversal of 1556421210240 is 420121246551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1556421210241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7376403735 + ... + 7376403945.

It is an arithmetic number, because the mean of its divisors is an integer number (7122945600).

Almost surely, 2^{1556421210240} is an apocalyptic number.

1556421210240 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 1556421210240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2735211110400).

1556421210240 is an abundant number, since it is smaller than the sum of its proper divisors (3914001010560).

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

1556421210240 is a wasteful number, since it uses less digits than its factorization.

1556421210240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 1556421210240 its reverse (420121246551), we get a palindrome (1976542456791).

The spelling of 1556421210240 in words is "one trillion, five hundred fifty-six billion, four hundred twenty-one million, two hundred ten thousand, two hundred forty".