551681568 has 144 divisors (see below), whose sum is σ = 1692381600. Its totient is φ = 169896960.

The previous prime is 551681567. The next prime is 551681579. The reversal of 551681568 is 865186155.

551681568 is a `hidden beast` number, since 5 + 5 + 1 + 6 + 81 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (551681561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223123 + ... + 225581.

It is an arithmetic number, because the mean of its divisors is an integer number (11752650).

Almost surely, 2^551681568 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 551681568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846190800).

551681568 is an abundant number, since it is smaller than the sum of its proper divisors (1140700032).

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

551681568 is a wasteful number, since it uses less digits than its factorization.

551681568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535 (or 2524 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 551681568 is about 23487.9025883539. The cubic root of 551681568 is about 820.1554176957.

The spelling of 551681568 in words is "five hundred fifty-one million, six hundred eighty-one thousand, five hundred sixty-eight".