16866001 has 2 divisors, whose sum is σ = 16866002. Its totient is φ = 16866000.

The previous prime is 16865983. The next prime is 16866029. The reversal of 16866001 is 10066861.

It is an a-pointer prime, because the next prime (16866029) can be obtained adding 16866001 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14432401 + 2433600 = 3799^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 16866001 - 2⁹ = 16865489 is a prime.

It is not a weakly prime, because it can be changed into another prime (16866701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8433000 + 8433001.

It is an arithmetic number, because the mean of its divisors is an integer number (8433001).

Almost surely, 2^16866001 is an apocalyptic number.

It is an amenable number.

16866001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16866001 is an equidigital number, since it uses as much as digits as its factorization.

16866001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 16866001 is about 4106.8237118240. The cubic root of 16866001 is about 256.4507896024.

The spelling of 16866001 in words is "sixteen million, eight hundred sixty-six thousand, one".