6547216691 has 2 divisors, whose sum is σ = 6547216692. Its totient is φ = 6547216690.

The previous prime is 6547216673. The next prime is 6547216717. The reversal of 6547216691 is 1966127456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6547216691 - 2¹⁴ = 6547200307 is a prime.

It is not a weakly prime, because it can be changed into another prime (6547216601) 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, 3273608345 + 3273608346.

It is an arithmetic number, because the mean of its divisors is an integer number (3273608346).

Almost surely, 2^6547216691 is an apocalyptic number.

6547216691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6547216691 is an equidigital number, since it uses as much as digits as its factorization.

6547216691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 6547216691 is about 80914.8731136619. The cubic root of 6547216691 is about 1870.7635734199.

The spelling of 6547216691 in words is "six billion, five hundred forty-seven million, two hundred sixteen thousand, six hundred ninety-one".