1668344026 has 4 divisors (see below), whose sum is σ = 2502516042. Its totient is φ = 834172012.

The previous prime is 1668343969. The next prime is 1668344047. The reversal of 1668344026 is 6204438661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1030731025 + 637613001 = 32105^2 + 25251^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1668344026.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417086005 + ... + 417086008.

Almost surely, 2^1668344026 is an apocalyptic number.

1668344026 is a deficient number, since it is larger than the sum of its proper divisors (834172016).

1668344026 is an equidigital number, since it uses as much as digits as its factorization.

1668344026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834172015.

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 1668344026 is about 40845.3672526028. The cubic root of 1668344026 is about 1186.0287140175.

The spelling of 1668344026 in words is "one billion, six hundred sixty-eight million, three hundred forty-four thousand, twenty-six".