1668604723 has 16 divisors (see below), whose sum is σ = 1814731776. Its totient is φ = 1528087680.

The previous prime is 1668604699. The next prime is 1668604733. The reversal of 1668604723 is 3274068661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668604723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 1668604723.

It is not an unprimeable number, because it can be changed into a prime (1668604733) 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, 193890 + ... + 202312.

It is an arithmetic number, because the mean of its divisors is an integer number (113420736).

Almost surely, 2^1668604723 is an apocalyptic number.

1668604723 is a deficient number, since it is larger than the sum of its proper divisors (146127053).

1668604723 is a wasteful number, since it uses less digits than its factorization.

1668604723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8754.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 1668604723 is about 40848.5583956154. The cubic root of 1668604723 is about 1186.0904874526.

The spelling of 1668604723 in words is "one billion, six hundred sixty-eight million, six hundred four thousand, seven hundred twenty-three".