1004051666 has 4 divisors (see below), whose sum is σ = 1506077502. Its totient is φ = 502025832.

The previous prime is 1004051641. The next prime is 1004051689. The reversal of 1004051666 is 6661504001.

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., 928969441 + 75082225 = 30479^2 + 8665^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 251012915 + ... + 251012918.

Almost surely, 2^1004051666 is an apocalyptic number.

1004051666 is a deficient number, since it is larger than the sum of its proper divisors (502025836).

1004051666 is an equidigital number, since it uses as much as digits as its factorization.

1004051666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502025835.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1004051666 is about 31686.7743072721. The cubic root of 1004051666 is about 1001.3487354283.

Adding to 1004051666 its reverse (6661504001), we get a palindrome (7665555667).

The spelling of 1004051666 in words is "one billion, four million, fifty-one thousand, six hundred sixty-six".