16428661 has 2 divisors, whose sum is σ = 16428662. Its totient is φ = 16428660.

The previous prime is 16428653. The next prime is 16428677. The reversal of 16428661 is 16682461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 5499025 = 3306^2 + 2345^2 .

It is an emirp because it is prime and its reverse (16682461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16428661 - 2³ = 16428653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16428611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8214330 + 8214331.

It is an arithmetic number, because the mean of its divisors is an integer number (8214331).

Almost surely, 2^16428661 is an apocalyptic number.

It is an amenable number.

16428661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16428661 is an equidigital number, since it uses as much as digits as its factorization.

16428661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 16428661 is about 4053.2284662970. The cubic root of 16428661 is about 254.2147366693.

The spelling of 16428661 in words is "sixteen million, four hundred twenty-eight thousand, six hundred sixty-one".