16645469 has 2 divisors, whose sum is σ = 16645470. Its totient is φ = 16645468.

The previous prime is 16645427. The next prime is 16645471. The reversal of 16645469 is 96454661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16297369 + 348100 = 4037^2 + 590^2 .

It is an emirp because it is prime and its reverse (96454661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16645469 - 2¹⁶ = 16579933 is a prime.

It is a super-2 number, since 2×16645469² = 554143276459922, which contains 22 as substring.

Together with 16645471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16642469) 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 as a sum of consecutive naturals, namely, 8322734 + 8322735.

It is an arithmetic number, because the mean of its divisors is an integer number (8322735).

Almost surely, 2^16645469 is an apocalyptic number.

It is an amenable number.

16645469 is a deficient number, since it is larger than the sum of its proper divisors (1).

16645469 is an equidigital number, since it uses as much as digits as its factorization.

16645469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 16645469 is about 4079.8859052675. The cubic root of 16645469 is about 255.3281383747.

The spelling of 16645469 in words is "sixteen million, six hundred forty-five thousand, four hundred sixty-nine".