1668067726 has 32 divisors (see below), whose sum is σ = 2750721120. Its totient is φ = 754000896.

The previous prime is 1668067721. The next prime is 1668067729. The reversal of 1668067726 is 6277608661.

It is a super-2 number, since 2×1668067726² = 5564899877045622152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1668067726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668067721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244230 + ... + 250966.

It is an arithmetic number, because the mean of its divisors is an integer number (85960035).

Almost surely, 2^1668067726 is an apocalyptic number.

1668067726 is a deficient number, since it is larger than the sum of its proper divisors (1082653394).

1668067726 is a wasteful number, since it uses less digits than its factorization.

1668067726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6948.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 1668067726 is about 40841.9848440303. The cubic root of 1668067726 is about 1185.9632363501.

The spelling of 1668067726 in words is "one billion, six hundred sixty-eight million, sixty-seven thousand, seven hundred twenty-six".