551243331520 has 112 divisors (see below), whose sum is σ = 1504421281728. Its totient is φ = 188462039040.

The previous prime is 551243331511. The next prime is 551243331619. The reversal of 551243331520 is 25133342155.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442150 + ... + 1139290.

Almost surely, 2^551243331520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551243331520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752210640864).

551243331520 is an abundant number, since it is smaller than the sum of its proper divisors (953177950208).

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

551243331520 is a wasteful number, since it uses less digits than its factorization.

551243331520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697518 (or 697508 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 551243331520 its reverse (25133342155), we get a palindrome (576376673675).

The spelling of 551243331520 in words is "five hundred fifty-one billion, two hundred forty-three million, three hundred thirty-one thousand, five hundred twenty".