551716643 has 2 divisors, whose sum is σ = 551716644. Its totient is φ = 551716642.

The previous prime is 551716637. The next prime is 551716723. The reversal of 551716643 is 346617155.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551716643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551716597 and 551716606.

It is not a weakly prime, because it can be changed into another prime (551716603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275858321 + 275858322.

It is an arithmetic number, because the mean of its divisors is an integer number (275858322).

Almost surely, 2^551716643 is an apocalyptic number.

551716643 is a deficient number, since it is larger than the sum of its proper divisors (1).

551716643 is an equidigital number, since it uses as much as digits as its factorization.

551716643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 551716643 is about 23488.6492374508. The cubic root of 551716643 is about 820.1727987015.

The spelling of 551716643 in words is "five hundred fifty-one million, seven hundred sixteen thousand, six hundred forty-three".