16666507163 has 4 divisors (see below), whose sum is σ = 16706095488. Its totient is φ = 16626918840.

The previous prime is 16666507157. The next prime is 16666507171. The reversal of 16666507163 is 36170566661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36170566661 = 26153 ⋅1383037.

It is a cyclic number.

It is not a de Polignac number, because 16666507163 - 2⁸ = 16666506907 is a prime.

It is a super-2 number, since 2×16666507163² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666507063) 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, 19793531 + ... + 19794372.

It is an arithmetic number, because the mean of its divisors is an integer number (4176523872).

Almost surely, 2^16666507163 is an apocalyptic number.

16666507163 is a deficient number, since it is larger than the sum of its proper divisors (39588325).

16666507163 is an equidigital number, since it uses as much as digits as its factorization.

16666507163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39588324.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 16666507163 in words is "sixteen billion, six hundred sixty-six million, five hundred seven thousand, one hundred sixty-three".