16665181123 has 4 divisors (see below), whose sum is σ = 16947641880. Its totient is φ = 16382720368.

The previous prime is 16665181109. The next prime is 16665181129. The reversal of 16665181123 is 32118156661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16665181123 is a prime.

It is a super-2 number, since 2×16665181123² (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 (16665181129) 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, 141230290 + ... + 141230407.

It is an arithmetic number, because the mean of its divisors is an integer number (4236910470).

Almost surely, 2^16665181123 is an apocalyptic number.

16665181123 is a deficient number, since it is larger than the sum of its proper divisors (282460757).

16665181123 is an equidigital number, since it uses as much as digits as its factorization.

16665181123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282460756.

The product of its digits is 51840, while the sum is 40.

The spelling of 16665181123 in words is "sixteen billion, six hundred sixty-five million, one hundred eighty-one thousand, one hundred twenty-three".