1555220432000 has 128 divisors (see below), whose sum is σ = 3869066288880. Its totient is φ = 621702144000.

The previous prime is 1555220431997. The next prime is 1555220432009. The reversal of 1555220432000 is 2340225551.

It can be written as a sum of positive squares in 8 ways, for example, as 40568405056 + 1514652026944 = 201416^2 + 1230712^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1555220432000² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1555220432009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26482670 + ... + 26541330.

Almost surely, 2^{1555220432000} is an apocalyptic number.

1555220432000 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 1555220432000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1934533144440).

1555220432000 is an abundant number, since it is smaller than the sum of its proper divisors (2313845856880).

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

1555220432000 is an equidigital number, since it uses as much as digits as its factorization.

1555220432000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60347 (or 60325 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 1555220432000 its reverse (2340225551), we get a palindrome (1557560657551).

The spelling of 1555220432000 in words is "one trillion, five hundred fifty-five billion, two hundred twenty million, four hundred thirty-two thousand".