551444242400 has 72 divisors (see below), whose sum is σ = 1346858717400. Its totient is φ = 220471938560.

The previous prime is 551444242399. The next prime is 551444242403. The reversal of 551444242400 is 4242444155.

It is a happy number.

It is a super-2 number, since 2×551444242400² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551444242403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1515002 + ... + 1843398.

It is an arithmetic number, because the mean of its divisors is an integer number (18706371075).

Almost surely, 2^551444242400 is an apocalyptic number.

551444242400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551444242400 is an abundant number, since it is smaller than the sum of its proper divisors (795414475000).

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

551444242400 is a wasteful number, since it uses less digits than its factorization.

551444242400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330516 (or 330503 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 35.

Adding to 551444242400 its reverse (4242444155), we get a palindrome (555686686555).

The spelling of 551444242400 in words is "five hundred fifty-one billion, four hundred forty-four million, two hundred forty-two thousand, four hundred".