551666363 has 4 divisors (see below), whose sum is σ = 551811120. Its totient is φ = 551521608.

The previous prime is 551666341. The next prime is 551666369. The reversal of 551666363 is 363666155.

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 551666363 - 2¹⁰ = 551665339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551666363.

It is not an unprimeable number, because it can be changed into a prime (551666369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66503 + ... + 74336.

It is an arithmetic number, because the mean of its divisors is an integer number (137952780).

Almost surely, 2^551666363 is an apocalyptic number.

551666363 is a deficient number, since it is larger than the sum of its proper divisors (144757).

551666363 is a wasteful number, since it uses less digits than its factorization.

551666363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144756.

The product of its digits is 291600, while the sum is 41.

The square root of 551666363 is about 23487.5789088616. The cubic root of 551666363 is about 820.1478828070.

The spelling of 551666363 in words is "five hundred fifty-one million, six hundred sixty-six thousand, three hundred sixty-three".