16506805 has 16 divisors (see below), whose sum is σ = 23192064. Its totient is φ = 11041920.

The previous prime is 16506803. The next prime is 16506811. The reversal of 16506805 is 50860561.

It is not a de Polignac number, because 16506805 - 2¹ = 16506803 is a prime.

It is a super-2 number, since 2×16506805² = 544949222616050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506803) 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 in 15 ways as a sum of consecutive naturals, for example, 4317 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (1449504).

Almost surely, 2^16506805 is an apocalyptic number.

It is an amenable number.

16506805 is a deficient number, since it is larger than the sum of its proper divisors (6685259).

16506805 is a wasteful number, since it uses less digits than its factorization.

16506805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11556.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 16506805 is about 4062.8567535664. The cubic root of 16506805 is about 254.6171622920.

The spelling of 16506805 in words is "sixteen million, five hundred six thousand, eight hundred five".