6566665423 has 2 divisors, whose sum is σ = 6566665424. Its totient is φ = 6566665422.

The previous prime is 6566665421. The next prime is 6566665451. The reversal of 6566665423 is 3245666656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6566665423 - 2¹ = 6566665421 is a prime.

Together with 6566665421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6566665421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283332711 + 3283332712.

It is an arithmetic number, because the mean of its divisors is an integer number (3283332712).

Almost surely, 2^6566665423 is an apocalyptic number.

6566665423 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566665423 is an equidigital number, since it uses as much as digits as its factorization.

6566665423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 49.

The square root of 6566665423 is about 81034.9642006461. The cubic root of 6566665423 is about 1872.6141313901.

The spelling of 6566665423 in words is "six billion, five hundred sixty-six million, six hundred sixty-five thousand, four hundred twenty-three".