426665543 has 2 divisors, whose sum is σ = 426665544. Its totient is φ = 426665542.

The previous prime is 426665531. The next prime is 426665549. The reversal of 426665543 is 345566624.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 426665543 - 2⁴ = 426665527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 426665543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426665549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213332771 + 213332772.

It is an arithmetic number, because the mean of its divisors is an integer number (213332772).

Almost surely, 2^426665543 is an apocalyptic number.

426665543 is a deficient number, since it is larger than the sum of its proper divisors (1).

426665543 is an equidigital number, since it uses as much as digits as its factorization.

426665543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 41.

The square root of 426665543 is about 20655.8839801157. The cubic root of 426665543 is about 752.8281622225.

The spelling of 426665543 in words is "four hundred twenty-six million, six hundred sixty-five thousand, five hundred forty-three".