551686161889 has 2 divisors, whose sum is σ = 551686161890. Its totient is φ = 551686161888.

The previous prime is 551686161881. The next prime is 551686161899. The reversal of 551686161889 is 988161686155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277000110864 + 274686051025 = 526308^2 + 524105^2 .

It is a cyclic number.

It is not a de Polignac number, because 551686161889 - 2³ = 551686161881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551686161889.

It is not a weakly prime, because it can be changed into another prime (551686161881) 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 as a sum of consecutive naturals, namely, 275843080944 + 275843080945.

It is an arithmetic number, because the mean of its divisors is an integer number (275843080945).

Almost surely, 2^551686161889 is an apocalyptic number.

It is an amenable number.

551686161889 is a deficient number, since it is larger than the sum of its proper divisors (1).

551686161889 is an equidigital number, since it uses as much as digits as its factorization.

551686161889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24883200, while the sum is 64.

The spelling of 551686161889 in words is "five hundred fifty-one billion, six hundred eighty-six million, one hundred sixty-one thousand, eight hundred eighty-nine".