551612216321 has 2 divisors, whose sum is σ = 551612216322. Its totient is φ = 551612216320.

The previous prime is 551612216147. The next prime is 551612216357. The reversal of 551612216321 is 123612216155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515472305296 + 36139911025 = 717964^2 + 190105^2 .

It is a cyclic number.

It is not a de Polignac number, because 551612216321 - 2²⁶ = 551545107457 is a prime.

It is a super-3 number, since 3×551612216321³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (551612216821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275806108160 + 275806108161.

It is an arithmetic number, because the mean of its divisors is an integer number (275806108161).

Almost surely, 2^551612216321 is an apocalyptic number.

It is an amenable number.

551612216321 is a deficient number, since it is larger than the sum of its proper divisors (1).

551612216321 is an equidigital number, since it uses as much as digits as its factorization.

551612216321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The spelling of 551612216321 in words is "five hundred fifty-one billion, six hundred twelve million, two hundred sixteen thousand, three hundred twenty-one".