551213363844 has 1152 divisors, whose sum is σ = 1910403532800. Its totient is φ = 135037393920.

The previous prime is 551213363807. The next prime is 551213363983. The reversal of 551213363844 is 448363312155.

551213363844 is a `hidden beast` number, since 5 + 5 + 1 + 2 + 1 + 3 + 3 + 638 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 551213363844.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 8227065099 + ... + 8227065165.

It is an arithmetic number, because the mean of its divisors is an integer number (1658336400).

Almost surely, 2^551213363844 is an apocalyptic number.

551213363844 is a gapful number since it is divisible by the number (54) 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 551213363844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955201766400).

551213363844 is an abundant number, since it is smaller than the sum of its proper divisors (1359190168956).

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

551213363844 is a wasteful number, since it uses less digits than its factorization.

551213363844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 191 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

Adding to 551213363844 its reverse (448363312155), we get a palindrome (999576675999).

The spelling of 551213363844 in words is "five hundred fifty-one billion, two hundred thirteen million, three hundred sixty-three thousand, eight hundred forty-four".