1668650904 has 48 divisors (see below), whose sum is σ = 4521741120. Its totient is φ = 555912000.

The previous prime is 1668650881. The next prime is 1668650909. The reversal of 1668650904 is 4090568661.

1668650904 is a `hidden beast` number, since 1 + 66 + 86 + 509 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1668650904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668650909) 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 11 ways as a sum of consecutive naturals, for example, 153654 + ... + 164154.

It is an arithmetic number, because the mean of its divisors is an integer number (94202940).

Almost surely, 2^1668650904 is an apocalyptic number.

It is an amenable number.

1668650904 is an abundant number, since it is smaller than the sum of its proper divisors (2853090216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668650904 is a wasteful number, since it uses less digits than its factorization.

1668650904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12720 (or 12713 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1668650904 is about 40849.1236625708. The cubic root of 1668650904 is about 1186.1014295966.

The spelling of 1668650904 in words is "one billion, six hundred sixty-eight million, six hundred fifty thousand, nine hundred four".