550916961565 has 4 divisors (see below), whose sum is σ = 661100353884. Its totient is φ = 440733569248.

The previous prime is 550916961541. The next prime is 550916961571. The reversal of 550916961565 is 565169619055.

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

It can be written as a sum of positive squares in 2 ways, for example, as 147816411961 + 403100549604 = 384469^2 + 634902^2 .

It is a cyclic number.

It is not a de Polignac number, because 550916961565 - 2³¹ = 548769477917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 55091696152 + ... + 55091696161.

It is an arithmetic number, because the mean of its divisors is an integer number (165275088471).

Almost surely, 2^550916961565 is an apocalyptic number.

It is an amenable number.

550916961565 is a deficient number, since it is larger than the sum of its proper divisors (110183392319).

550916961565 is a wasteful number, since it uses less digits than its factorization.

550916961565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110183392318.

The product of its (nonzero) digits is 10935000, while the sum is 58.

The spelling of 550916961565 in words is "five hundred fifty billion, nine hundred sixteen million, nine hundred sixty-one thousand, five hundred sixty-five".