551551221143532 has 192 divisors, whose sum is σ = 1499915239280640. Its totient is φ = 175066885723392.

The previous prime is 551551221143513. The next prime is 551551221143557. The reversal of 551551221143532 is 235341122155155.

551551221143532 is a `hidden beast` number, since 5 + 5 + 1 + 5 + 51 + 2 + 21 + 1 + 43 + 532 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4604526913 + ... + 4604646695.

It is an arithmetic number, because the mean of its divisors is an integer number (7812058537920).

Almost surely, 2^{551551221143532} 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 551551221143532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749957619640320).

551551221143532 is an abundant number, since it is smaller than the sum of its proper divisors (948364018137108).

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

551551221143532 is a wasteful number, since it uses less digits than its factorization.

551551221143532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144397 (or 144389 counting only the distinct ones).

The product of its digits is 900000, while the sum is 45.

Adding to 551551221143532 its reverse (235341122155155), we get a palindrome (786892343298687).

The spelling of 551551221143532 in words is "five hundred fifty-one trillion, five hundred fifty-one billion, two hundred twenty-one million, one hundred forty-three thousand, five hundred thirty-two".