551545565 has 4 divisors (see below), whose sum is σ = 661854684. Its totient is φ = 441236448.

The previous prime is 551545529. The next prime is 551545597. The reversal of 551545565 is 565545155.

It is a happy number.

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 234028804 + 317516761 = 15298^2 + 17819^2 .

It is a cyclic number.

It is not a de Polignac number, because 551545565 - 2¹² = 551541469 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55154552 + ... + 55154561.

It is an arithmetic number, because the mean of its divisors is an integer number (165463671).

Almost surely, 2^551545565 is an apocalyptic number.

It is an amenable number.

551545565 is a deficient number, since it is larger than the sum of its proper divisors (110309119).

551545565 is a wasteful number, since it uses less digits than its factorization.

551545565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110309118.

The product of its digits is 375000, while the sum is 41.

The square root of 551545565 is about 23485.0072386619. The cubic root of 551545565 is about 820.0880160332.

The spelling of 551545565 in words is "five hundred fifty-one million, five hundred forty-five thousand, five hundred sixty-five".