1000664543 has 2 divisors, whose sum is σ = 1000664544. Its totient is φ = 1000664542.

The previous prime is 1000664503. The next prime is 1000664551. The reversal of 1000664543 is 3454660001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000664543 - 2¹⁶ = 1000599007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000664503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500332271 + 500332272.

It is an arithmetic number, because the mean of its divisors is an integer number (500332272).

Almost surely, 2^1000664543 is an apocalyptic number.

1000664543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000664543 is an equidigital number, since it uses as much as digits as its factorization.

1000664543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1000664543 is about 31633.2822040331. The cubic root of 1000664543 is about 1000.2214652828.

The spelling of 1000664543 in words is "one billion, six hundred sixty-four thousand, five hundred forty-three".