551066663 has 4 divisors (see below), whose sum is σ = 629790480. Its totient is φ = 472342848.

The previous prime is 551066657. The next prime is 551066689. The reversal of 551066663 is 366660155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551066663 - 2²⁸ = 282631207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551066623) 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 3 ways as a sum of consecutive naturals, for example, 39361898 + ... + 39361911.

It is an arithmetic number, because the mean of its divisors is an integer number (157447620).

Almost surely, 2^551066663 is an apocalyptic number.

551066663 is a deficient number, since it is larger than the sum of its proper divisors (78723817).

551066663 is an equidigital number, since it uses as much as digits as its factorization.

551066663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78723816.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 551066663 is about 23474.8091153049. The cubic root of 551066663 is about 819.8505889784.

The spelling of 551066663 in words is "five hundred fifty-one million, sixty-six thousand, six hundred sixty-three".