1666432403 has 8 divisors (see below), whose sum is σ = 1696820400. Its totient is φ = 1636115968.

The previous prime is 1666432321. The next prime is 1666432421. The reversal of 1666432403 is 3042346661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666432403 - 2²⁰ = 1665383827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666432433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30275 + ... + 65187.

It is an arithmetic number, because the mean of its divisors is an integer number (212102550).

Almost surely, 2^1666432403 is an apocalyptic number.

1666432403 is a deficient number, since it is larger than the sum of its proper divisors (30387997).

1666432403 is an equidigital number, since it uses as much as digits as its factorization.

1666432403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35781.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 1666432403 is about 40821.9598133162. The cubic root of 1666432403 is about 1185.5755488360.

The spelling of 1666432403 in words is "one billion, six hundred sixty-six million, four hundred thirty-two thousand, four hundred three".