551961856 has 72 divisors (see below), whose sum is σ = 1191488480. Its totient is φ = 254306304.

The previous prime is 551961829. The next prime is 551961929. The reversal of 551961856 is 658169155.

It is a super-3 number, since 3×551961856³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178435 + ... + 181501.

Almost surely, 2^551961856 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 551961856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (595744240).

551961856 is an abundant number, since it is smaller than the sum of its proper divisors (639526624).

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

551961856 is a wasteful number, since it uses less digits than its factorization.

551961856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 3125 counting only the distinct ones).

The product of its digits is 324000, while the sum is 46.

The square root of 551961856 is about 23493.8684766898. The cubic root of 551961856 is about 820.2942905619.

The spelling of 551961856 in words is "five hundred fifty-one million, nine hundred sixty-one thousand, eight hundred fifty-six".