551665 has 8 divisors (see below), whose sum is σ = 696960. Its totient is φ = 418032.

The previous prime is 551659. The next prime is 551671. The reversal of 551665 is 566155.

551665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (551659) and next prime (551671).

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 551665 - 2¹⁷ = 420593 is a prime.

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, 2809 + ... + 2998.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁵⁵¹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

551665 is a deficient number, since it is larger than the sum of its proper divisors (145295).

551665 is a wasteful number, since it uses less digits than its factorization.

551665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831.

The product of its digits is 4500, while the sum is 28.

The square root of 551665 is about 742.7415432033. The cubic root of 551665 is about 82.0147207361.

The spelling of 551665 in words is "five hundred fifty-one thousand, six hundred sixty-five".