551423223581 has 2 divisors, whose sum is σ = 551423223582. Its totient is φ = 551423223580.

The previous prime is 551423223563. The next prime is 551423223583. The reversal of 551423223581 is 185322324155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446230680025 + 105192543556 = 668005^2 + 324334^2 .

It is a cyclic number.

It is not a de Polignac number, because 551423223581 - 2²⁶ = 551356114717 is a prime.

It is a super-2 number, since 2×551423223581² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 551423223583, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551423223583) 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, 275711611790 + 275711611791.

It is an arithmetic number, because the mean of its divisors is an integer number (275711611791).

Almost surely, 2^551423223581 is an apocalyptic number.

It is an amenable number.

551423223581 is a deficient number, since it is larger than the sum of its proper divisors (1).

551423223581 is an equidigital number, since it uses as much as digits as its factorization.

551423223581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288000, while the sum is 41.

It can be divided in two parts, 55142 and 3223581, that added together give a palindrome (3278723).

The spelling of 551423223581 in words is "five hundred fifty-one billion, four hundred twenty-three million, two hundred twenty-three thousand, five hundred eighty-one".