1668532643 has 16 divisors (see below), whose sum is σ = 1781844480. Its totient is φ = 1556966400.

The previous prime is 1668532639. The next prime is 1668532699. The reversal of 1668532643 is 3462358661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1668532643 - 2² = 1668532639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668532594 and 1668532603.

It is not an unprimeable number, because it can be changed into a prime (1668532343) 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 in 15 ways as a sum of consecutive naturals, for example, 1262423 + ... + 1263743.

It is an arithmetic number, because the mean of its divisors is an integer number (111365280).

Almost surely, 2^1668532643 is an apocalyptic number.

1668532643 is a deficient number, since it is larger than the sum of its proper divisors (113311837).

1668532643 is a wasteful number, since it uses less digits than its factorization.

1668532643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918.

The product of its digits is 622080, while the sum is 44.

The square root of 1668532643 is about 40847.6761028091. The cubic root of 1668532643 is about 1186.0734083860.

The spelling of 1668532643 in words is "one billion, six hundred sixty-eight million, five hundred thirty-two thousand, six hundred forty-three".