551331021400 has 24 divisors (see below), whose sum is σ = 1281844625220. Its totient is φ = 220532408480.

The previous prime is 551331021383. The next prime is 551331021421. The reversal of 551331021400 is 4120133155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1378327354 + ... + 1378327753.

Almost surely, 2^551331021400 is an apocalyptic number.

551331021400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551331021400 is an abundant number, since it is smaller than the sum of its proper divisors (730513603820).

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

551331021400 is a wasteful number, since it uses less digits than its factorization.

551331021400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756655123 (or 2756655114 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 551331021400 its reverse (4120133155), we get a palindrome (555451154555).

The spelling of 551331021400 in words is "five hundred fifty-one billion, three hundred thirty-one million, twenty-one thousand, four hundred".