1666016403 has 4 divisors (see below), whose sum is σ = 2221355208. Its totient is φ = 1110677600.

The previous prime is 1666016399. The next prime is 1666016413. The reversal of 1666016403 is 3046106661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1666016403 - 2² = 1666016399 is a prime.

It is a super-2 number, since 2×1666016403² = 5551221310130116818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666016413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277669398 + ... + 277669403.

It is an arithmetic number, because the mean of its divisors is an integer number (555338802).

Almost surely, 2^1666016403 is an apocalyptic number.

1666016403 is a deficient number, since it is larger than the sum of its proper divisors (555338805).

1666016403 is an equidigital number, since it uses as much as digits as its factorization.

1666016403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555338804.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 1666016403 is about 40816.8641985148. The cubic root of 1666016403 is about 1185.4768868734.

The spelling of 1666016403 in words is "one billion, six hundred sixty-six million, sixteen thousand, four hundred three".