551243663 has 8 divisors (see below), whose sum is σ = 554037408. Its totient is φ = 548457184.

The previous prime is 551243657. The next prime is 551243689. The reversal of 551243663 is 366342155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551243663 - 2²⁶ = 484134799 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 (551243263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205670 + ... + 208332.

It is an arithmetic number, because the mean of its divisors is an integer number (69254676).

Almost surely, 2^551243663 is an apocalyptic number.

551243663 is a deficient number, since it is larger than the sum of its proper divisors (2793745).

551243663 is a wasteful number, since it uses less digits than its factorization.

551243663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633.

The product of its digits is 64800, while the sum is 35.

The square root of 551243663 is about 23478.5788113335. The cubic root of 551243663 is about 819.9383569565.

The spelling of 551243663 in words is "five hundred fifty-one million, two hundred forty-three thousand, six hundred sixty-three".