555121400000 has 336 divisors, whose sum is σ = 1492162432992. Its totient is φ = 204072960000.

The previous prime is 555121399961. The next prime is 555121400003. The reversal of 555121400000 is 4121555.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (555121400003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146198102 + ... + 146201898.

It is an arithmetic number, because the mean of its divisors is an integer number (4440959622).

Almost surely, 2^555121400000 is an apocalyptic number.

555121400000 is a gapful number since it is divisible by the number (50) 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 555121400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746081216496).

555121400000 is an abundant number, since it is smaller than the sum of its proper divisors (937041032992).

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

555121400000 is an equidigital number, since it uses as much as digits as its factorization.

555121400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894 (or 3864 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 555121400000 its reverse (4121555), we get a palindrome (555125521555).

The spelling of 555121400000 in words is "five hundred fifty-five billion, one hundred twenty-one million, four hundred thousand".