16505803 has 2 divisors, whose sum is σ = 16505804. Its totient is φ = 16505802.

The previous prime is 16505777. The next prime is 16505837. The reversal of 16505803 is 30850561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16505803 - 2⁵ = 16505771 is a prime.

It is not a weakly prime, because it can be changed into another prime (16505003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252901 + 8252902.

It is an arithmetic number, because the mean of its divisors is an integer number (8252902).

Almost surely, 2^16505803 is an apocalyptic number.

16505803 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505803 is an equidigital number, since it uses as much as digits as its factorization.

16505803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 16505803 is about 4062.7334394469. The cubic root of 16505803 is about 254.6120102439.

The spelling of 16505803 in words is "sixteen million, five hundred five thousand, eight hundred three".