551322321000 has 256 divisors, whose sum is σ = 1937036574720. Its totient is φ = 129342240000.

The previous prime is 551322320981. The next prime is 551322321007. The reversal of 551322321000 is 123223155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (551322321007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 753537 + ... + 1292463.

It is an arithmetic number, because the mean of its divisors is an integer number (7566549120).

Almost surely, 2^551322321000 is an apocalyptic number.

551322321000 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 551322321000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968518287360).

551322321000 is an abundant number, since it is smaller than the sum of its proper divisors (1385714253720).

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

551322321000 is a wasteful number, since it uses less digits than its factorization.

551322321000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538993 (or 538979 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 551322321000 its reverse (123223155), we get a palindrome (551445544155).

The spelling of 551322321000 in words is "five hundred fifty-one billion, three hundred twenty-two million, three hundred twenty-one thousand".