16689963 has 4 divisors (see below), whose sum is σ = 22253288. Its totient is φ = 11126640.

The previous prime is 16689941. The next prime is 16690001. The reversal of 16689963 is 36998661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16689963 - 2¹⁰ = 16688939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16689913) 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, 2781658 + ... + 2781663.

It is an arithmetic number, because the mean of its divisors is an integer number (5563322).

Almost surely, 2^16689963 is an apocalyptic number.

16689963 is a deficient number, since it is larger than the sum of its proper divisors (5563325).

16689963 is an equidigital number, since it uses as much as digits as its factorization.

16689963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563324.

The product of its digits is 419904, while the sum is 48.

The square root of 16689963 is about 4085.3351147733. The cubic root of 16689963 is about 255.5554367219. Note that the first 3 decimals are identical.

The spelling of 16689963 in words is "sixteen million, six hundred eighty-nine thousand, nine hundred sixty-three".