16166816663 has 4 divisors (see below), whose sum is σ = 16294114560. Its totient is φ = 16039518768.

The previous prime is 16166816573. The next prime is 16166816713. The reversal of 16166816663 is 36661866161.

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 16166816663 - 2¹² = 16166812567 is a prime.

It is a super-2 number, since 2×16166816663² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16166815663) 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 3 ways as a sum of consecutive naturals, for example, 63648758 + ... + 63649011.

It is an arithmetic number, because the mean of its divisors is an integer number (4073528640).

Almost surely, 2^16166816663 is an apocalyptic number.

16166816663 is a deficient number, since it is larger than the sum of its proper divisors (127297897).

16166816663 is a wasteful number, since it uses less digits than its factorization.

16166816663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127297896.

The product of its digits is 1119744, while the sum is 50.

The spelling of 16166816663 in words is "sixteen billion, one hundred sixty-six million, eight hundred sixteen thousand, six hundred sixty-three".