16423840066 has 4 divisors (see below), whose sum is σ = 24635760102. Its totient is φ = 8211920032.

The previous prime is 16423840051. The next prime is 16423840079. The reversal of 16423840066 is 66004832461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66004832461 = 3637 ⋅18148153.

It can be written as a sum of positive squares in only one way, i.e., 15882300625 + 541539441 = 126025^2 + 23271^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4105960015 + ... + 4105960018.

Almost surely, 2^16423840066 is an apocalyptic number.

16423840066 is a deficient number, since it is larger than the sum of its proper divisors (8211920036).

16423840066 is an equidigital number, since it uses as much as digits as its factorization.

16423840066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8211920035.

The product of its (nonzero) digits is 165888, while the sum is 40.

It can be divided in two parts, 164238 and 40066, that added together give a square (204304 = 452²).

The spelling of 16423840066 in words is "sixteen billion, four hundred twenty-three million, eight hundred forty thousand, sixty-six".