551907707788721 has 2 divisors, whose sum is σ = 551907707788722. Its totient is φ = 551907707788720.

The previous prime is 551907707788709. The next prime is 551907707788903. The reversal of 551907707788721 is 127887707709155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319921909822321 + 231985797966400 = 17886361^2 + 15231080^2 .

It is a cyclic number.

It is not a de Polignac number, because 551907707788721 - 2¹⁰ = 551907707787697 is a prime.

It is not a weakly prime, because it can be changed into another prime (551907707788321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275953853894360 + 275953853894361.

It is an arithmetic number, because the mean of its divisors is an integer number (275953853894361).

Almost surely, 2^{551907707788721} is an apocalyptic number.

It is an amenable number.

551907707788721 is a deficient number, since it is larger than the sum of its proper divisors (1).

551907707788721 is an equidigital number, since it uses as much as digits as its factorization.

551907707788721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 484041600, while the sum is 74.

The spelling of 551907707788721 in words is "five hundred fifty-one trillion, nine hundred seven billion, seven hundred seven million, seven hundred eighty-eight thousand, seven hundred twenty-one".