16066405 has 4 divisors (see below), whose sum is σ = 19279692. Its totient is φ = 12853120.

The previous prime is 16066403. The next prime is 16066417. The reversal of 16066405 is 50466061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50466061 = 29 ⋅1740209.

It can be written as a sum of positive squares in 2 ways, for example, as 11512449 + 4553956 = 3393^2 + 2134^2 .

It is not a de Polignac number, because 16066405 - 2¹ = 16066403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16066403) 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, 1606636 + ... + 1606645.

It is an arithmetic number, because the mean of its divisors is an integer number (4819923).

Almost surely, 2^16066405 is an apocalyptic number.

It is an amenable number.

16066405 is a deficient number, since it is larger than the sum of its proper divisors (3213287).

16066405 is an equidigital number, since it uses as much as digits as its factorization.

16066405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213286.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 16066405 is about 4008.2920302792. The cubic root of 16066405 is about 252.3323332210.

It can be divided in two parts, 16066 and 405, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 16066405 in words is "sixteen million, sixty-six thousand, four hundred five".