551665218497 has 2 divisors, whose sum is σ = 551665218498. Its totient is φ = 551665218496.

The previous prime is 551665218491. The next prime is 551665218547. The reversal of 551665218497 is 794812566155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419811989041 + 131853229456 = 647929^2 + 363116^2 .

It is a cyclic number.

It is not a de Polignac number, because 551665218497 - 2⁸ = 551665218241 is a prime.

It is not a weakly prime, because it can be changed into another prime (551665218491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275832609248 + 275832609249.

It is an arithmetic number, because the mean of its divisors is an integer number (275832609249).

Almost surely, 2^551665218497 is an apocalyptic number.

It is an amenable number.

551665218497 is a deficient number, since it is larger than the sum of its proper divisors (1).

551665218497 is an equidigital number, since it uses as much as digits as its factorization.

551665218497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144000, while the sum is 59.

The spelling of 551665218497 in words is "five hundred fifty-one billion, six hundred sixty-five million, two hundred eighteen thousand, four hundred ninety-seven".