551560665 has 64 divisors (see below), whose sum is σ = 978656256. Its totient is φ = 264056832.

The previous prime is 551560661. The next prime is 551560673. The reversal of 551560665 is 566065155.

It is not a de Polignac number, because 551560665 - 2² = 551560661 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (551560661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 499504 + ... + 500606.

It is an arithmetic number, because the mean of its divisors is an integer number (15291504).

Almost surely, 2^551560665 is an apocalyptic number.

It is an amenable number.

551560665 is a deficient number, since it is larger than the sum of its proper divisors (427095591).

551560665 is a wasteful number, since it uses less digits than its factorization.

551560665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 551560665 is about 23485.3287181593. The cubic root of 551560665 is about 820.0954999818.

The spelling of 551560665 in words is "five hundred fifty-one million, five hundred sixty thousand, six hundred sixty-five".