16689506 has 8 divisors (see below), whose sum is σ = 25052160. Its totient is φ = 8338788.

The previous prime is 16689503. The next prime is 16689509. The reversal of 16689506 is 60598661.

It is an interprime number because it is at equal distance from previous prime (16689503) and next prime (16689509).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16689506² = 557079221048072, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16689503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2615 + ... + 6341.

It is an arithmetic number, because the mean of its divisors is an integer number (3131520).

Almost surely, 2^16689506 is an apocalyptic number.

16689506 is a deficient number, since it is larger than the sum of its proper divisors (8362654).

16689506 is a wasteful number, since it uses less digits than its factorization.

16689506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5968.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 16689506 is about 4085.2791826263. The cubic root of 16689506 is about 255.5531041843.

The spelling of 16689506 in words is "sixteen million, six hundred eighty-nine thousand, five hundred six".