550777861 has 2 divisors, whose sum is σ = 550777862. Its totient is φ = 550777860.

The previous prime is 550777853. The next prime is 550777873. The reversal of 550777861 is 168777055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544989025 + 5788836 = 23345^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 550777861 - 2³ = 550777853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550777811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275388930 + 275388931.

It is an arithmetic number, because the mean of its divisors is an integer number (275388931).

Almost surely, 2^550777861 is an apocalyptic number.

It is an amenable number.

550777861 is a deficient number, since it is larger than the sum of its proper divisors (1).

550777861 is an equidigital number, since it uses as much as digits as its factorization.

550777861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 411600, while the sum is 46.

The square root of 550777861 is about 23468.6569918264. The cubic root of 550777861 is about 819.7073420232.

The spelling of 550777861 in words is "five hundred fifty million, seven hundred seventy-seven thousand, eight hundred sixty-one".