551166565549 has 2 divisors, whose sum is σ = 551166565550. Its totient is φ = 551166565548.

The previous prime is 551166565501. The next prime is 551166565613. The reversal of 551166565549 is 945565661155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546279157449 + 4887408100 = 739107^2 + 69910^2 .

It is a cyclic number.

It is not a de Polignac number, because 551166565549 - 2¹⁵ = 551166532781 is a prime.

It is a super-4 number, since 4×551166565549⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 551166565493 and 551166565502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551166575549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275583282774 + 275583282775.

It is an arithmetic number, because the mean of its divisors is an integer number (275583282775).

Almost surely, 2^551166565549 is an apocalyptic number.

It is an amenable number.

551166565549 is a deficient number, since it is larger than the sum of its proper divisors (1).

551166565549 is an equidigital number, since it uses as much as digits as its factorization.

551166565549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300000, while the sum is 58.

The spelling of 551166565549 in words is "five hundred fifty-one billion, one hundred sixty-six million, five hundred sixty-five thousand, five hundred forty-nine".