16664057 has 2 divisors, whose sum is σ = 16664058. Its totient is φ = 16664056.

The previous prime is 16664027. The next prime is 16664059. The reversal of 16664057 is 75046661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16168441 + 495616 = 4021^2 + 704^2 .

It is an emirp because it is prime and its reverse (75046661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16664057 - 2¹⁰ = 16663033 is a prime.

Together with 16664059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16664059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332028 + 8332029.

It is an arithmetic number, because the mean of its divisors is an integer number (8332029).

Almost surely, 2^16664057 is an apocalyptic number.

It is an amenable number.

16664057 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664057 is an equidigital number, since it uses as much as digits as its factorization.

16664057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 16664057 is about 4082.1632745396. The cubic root of 16664057 is about 255.4231446874.

The spelling of 16664057 in words is "sixteen million, six hundred sixty-four thousand, fifty-seven".