6543222691 has 2 divisors, whose sum is σ = 6543222692. Its totient is φ = 6543222690.

The previous prime is 6543222649. The next prime is 6543222737. The reversal of 6543222691 is 1962223456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6543222691 - 2²⁵ = 6509668259 is a prime.

It is not a weakly prime, because it can be changed into another prime (6543225691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271611345 + 3271611346.

It is an arithmetic number, because the mean of its divisors is an integer number (3271611346).

Almost surely, 2^6543222691 is an apocalyptic number.

6543222691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543222691 is an equidigital number, since it uses as much as digits as its factorization.

6543222691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 6543222691 is about 80890.1890899014. The cubic root of 6543222691 is about 1870.3830886059.

The spelling of 6543222691 in words is "six billion, five hundred forty-three million, two hundred twenty-two thousand, six hundred ninety-one".