16681552 has 10 divisors (see below), whose sum is σ = 32320538. Its totient is φ = 8340768.

The previous prime is 16681523. The next prime is 16681579. The reversal of 16681552 is 25518661.

It is a happy number.

16681552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 968256 = 3964^2 + 984^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521283 + ... + 521314.

Almost surely, 2^16681552 is an apocalyptic number.

It is an amenable number.

16681552 is a deficient number, since it is larger than the sum of its proper divisors (15638986).

16681552 is a wasteful number, since it uses less digits than its factorization.

16681552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042605 (or 1042599 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 16681552 is about 4084.3055713303. The cubic root of 16681552 is about 255.5124999788.

It can be divided in two parts, 166 and 81552, that added together give a palindrome (81718).

The spelling of 16681552 in words is "sixteen million, six hundred eighty-one thousand, five hundred fifty-two".