16066521 has 12 divisors (see below), whose sum is σ = 23364900. Its totient is φ = 10638240.

The previous prime is 16066517. The next prime is 16066537. The reversal of 16066521 is 12566061.

It is a happy number.

16066521 is a `hidden beast` number, since 1 + 6 + 0 + 6 + 652 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9363600 + 6702921 = 3060^2 + 2589^2 .

It is not a de Polignac number, because 16066521 - 2² = 16066517 is a prime.

It is a super-3 number, since 3×16066521³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16066541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4650 + ... + 7331.

It is an arithmetic number, because the mean of its divisors is an integer number (1947075).

Almost surely, 2^16066521 is an apocalyptic number.

It is an amenable number.

16066521 is a deficient number, since it is larger than the sum of its proper divisors (7298379).

16066521 is a wasteful number, since it uses less digits than its factorization.

16066521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12136 (or 12133 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 16066521 is about 4008.3065002567. The cubic root of 16066521 is about 252.3329405022.

The spelling of 16066521 in words is "sixteen million, sixty-six thousand, five hundred twenty-one".