551803618493 has 2 divisors, whose sum is σ = 551803618494. Its totient is φ = 551803618492.

The previous prime is 551803618469. The next prime is 551803618559. The reversal of 551803618493 is 394816308155.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442548249049 + 109255369444 = 665243^2 + 330538^2 .

It is a cyclic number.

It is not a de Polignac number, because 551803618493 - 2³² = 547508651197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551803618403) 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, 275901809246 + 275901809247.

It is an arithmetic number, because the mean of its divisors is an integer number (275901809247).

Almost surely, 2^551803618493 is an apocalyptic number.

It is an amenable number.

551803618493 is a deficient number, since it is larger than the sum of its proper divisors (1).

551803618493 is an equidigital number, since it uses as much as digits as its factorization.

551803618493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 551803618493 in words is "five hundred fifty-one billion, eight hundred three million, six hundred eighteen thousand, four hundred ninety-three".