551166565597 has 4 divisors (see below), whose sum is σ = 551460836860. Its totient is φ = 550872294336.

The previous prime is 551166565549. The next prime is 551166565613. The reversal of 551166565597 is 795565661155.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 795565661155 = 5 ⋅159113132231.

It can be written as a sum of positive squares in 2 ways, for example, as 64773304036 + 486393261561 = 254506^2 + 697419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551166565597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551166505597) by changing a digit.

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, 147132822 + ... + 147136567.

It is an arithmetic number, because the mean of its divisors is an integer number (137865209215).

Almost surely, 2^551166565597 is an apocalyptic number.

It is an amenable number.

551166565597 is a deficient number, since it is larger than the sum of its proper divisors (294271263).

551166565597 is a wasteful number, since it uses less digits than its factorization.

551166565597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294271262.

The product of its digits is 42525000, while the sum is 61.

The spelling of 551166565597 in words is "five hundred fifty-one billion, one hundred sixty-six million, five hundred sixty-five thousand, five hundred ninety-seven".