16686505 has 12 divisors (see below), whose sum is σ = 22010436. Its totient is φ = 12135200.

The previous prime is 16686497. The next prime is 16686511. The reversal of 16686505 is 50568661.

It can be written as a sum of positive squares in 2 ways, for example, as 12938409 + 3748096 = 3597^2 + 1936^2 .

It is not a de Polignac number, because 16686505 - 2³ = 16686497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13186 + ... + 14395.

It is an arithmetic number, because the mean of its divisors is an integer number (1834203).

Almost surely, 2^16686505 is an apocalyptic number.

It is an amenable number.

16686505 is a deficient number, since it is larger than the sum of its proper divisors (5323931).

16686505 is a wasteful number, since it uses less digits than its factorization.

16686505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27608 (or 27597 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 16686505 is about 4084.9118717544. The cubic root of 16686505 is about 255.5377859590.

The spelling of 16686505 in words is "sixteen million, six hundred eighty-six thousand, five hundred five".