551661606511 has 2 divisors, whose sum is σ = 551661606512. Its totient is φ = 551661606510.

The previous prime is 551661606443. The next prime is 551661606527. The reversal of 551661606511 is 115606166155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551661606511 - 2⁷ = 551661606383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551661606571) 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, 275830803255 + 275830803256.

It is an arithmetic number, because the mean of its divisors is an integer number (275830803256).

Almost surely, 2^551661606511 is an apocalyptic number.

551661606511 is a deficient number, since it is larger than the sum of its proper divisors (1).

551661606511 is an equidigital number, since it uses as much as digits as its factorization.

551661606511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 551661606511 in words is "five hundred fifty-one billion, six hundred sixty-one million, six hundred six thousand, five hundred eleven".