1666425604 has 12 divisors (see below), whose sum is σ = 2956193884. Its totient is φ = 821798784.

The previous prime is 1666425599. The next prime is 1666425613. The reversal of 1666425604 is 4065246661.

It can be written as a sum of positive squares in 2 ways, for example, as 613552900 + 1052872704 = 24770^2 + 32448^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2853177 + ... + 2853760.

Almost surely, 2^1666425604 is an apocalyptic number.

It is an amenable number.

1666425604 is a deficient number, since it is larger than the sum of its proper divisors (1289768280).

1666425604 is a wasteful number, since it uses less digits than its factorization.

1666425604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5707014 (or 5707012 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 1666425604 is about 40821.8765369746. The cubic root of 1666425604 is about 1185.5739364615.

The spelling of 1666425604 in words is "one billion, six hundred sixty-six million, four hundred twenty-five thousand, six hundred four".