551166561643 has 2 divisors, whose sum is σ = 551166561644. Its totient is φ = 551166561642.

The previous prime is 551166561641. The next prime is 551166561653. The reversal of 551166561643 is 346165661155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551166561643 - 2¹ = 551166561641 is a prime.

Together with 551166561641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (551166561641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275583280821 + 275583280822.

It is an arithmetic number, because the mean of its divisors is an integer number (275583280822).

Almost surely, 2^551166561643 is an apocalyptic number.

551166561643 is a deficient number, since it is larger than the sum of its proper divisors (1).

551166561643 is an equidigital number, since it uses as much as digits as its factorization.

551166561643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 49.

The spelling of 551166561643 in words is "five hundred fifty-one billion, one hundred sixty-six million, five hundred sixty-one thousand, six hundred forty-three".