1666604463 has 8 divisors (see below), whose sum is σ = 2223052800. Its totient is φ = 1110612888.

The previous prime is 1666604419. The next prime is 1666604491. The reversal of 1666604463 is 3644066661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666604463 - 2⁸ = 1666604207 is a prime.

It is a super-3 number, since 3×1666604463³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666614463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105583 + ... + 120336.

It is an arithmetic number, because the mean of its divisors is an integer number (277881600).

Almost surely, 2^1666604463 is an apocalyptic number.

1666604463 is a deficient number, since it is larger than the sum of its proper divisors (556448337).

1666604463 is a wasteful number, since it uses less digits than its factorization.

1666604463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228381.

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 1666604463 is about 40824.0672030605. The cubic root of 1666604463 is about 1185.6163511928.

The spelling of 1666604463 in words is "one billion, six hundred sixty-six million, six hundred four thousand, four hundred sixty-three".