16678901 has 2 divisors, whose sum is σ = 16678902. Its totient is φ = 16678900.

The previous prime is 16678889. The next prime is 16678919. The reversal of 16678901 is 10987661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9006001 + 7672900 = 3001^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 16678901 - 2¹⁴ = 16662517 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16678951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8339450 + 8339451.

It is an arithmetic number, because the mean of its divisors is an integer number (8339451).

Almost surely, 2^16678901 is an apocalyptic number.

It is an amenable number.

16678901 is a deficient number, since it is larger than the sum of its proper divisors (1).

16678901 is an equidigital number, since it uses as much as digits as its factorization.

16678901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16678901 is about 4083.9810234623. The cubic root of 16678901 is about 255.4989640776.

The spelling of 16678901 in words is "sixteen million, six hundred seventy-eight thousand, nine hundred one".