551521403312 has 80 divisors (see below), whose sum is σ = 1186213220352. Its totient is φ = 246303087360.

The previous prime is 551521403309. The next prime is 551521403317. The reversal of 551521403312 is 213304125155.

It is a super-2 number, since 2×551521403312² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551521403317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4455278 + ... + 4577394.

Almost surely, 2^551521403312 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 551521403312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (593106610176).

551521403312 is an abundant number, since it is smaller than the sum of its proper divisors (634691817040).

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

551521403312 is a wasteful number, since it uses less digits than its factorization.

551521403312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122586 (or 122580 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 551521403312 its reverse (213304125155), we get a palindrome (764825528467).

The spelling of 551521403312 in words is "five hundred fifty-one billion, five hundred twenty-one million, four hundred three thousand, three hundred twelve".