16557696 has 80 divisors (see below), whose sum is σ = 49306290. Its totient is φ = 5515776.

The previous prime is 16557661. The next prime is 16557707. The reversal of 16557696 is 69675561.

16557696 is a `hidden beast` number, since 1 + 6 + 557 + 6 + 96 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 876096 = 3960^2 + 936^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9570 + ... + 11166.

Almost surely, 2^16557696 is an apocalyptic number.

16557696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16557696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24653145).

16557696 is an abundant number, since it is smaller than the sum of its proper divisors (32748594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16557696 is an equidigital number, since it uses as much as digits as its factorization.

16557696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1602 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 16557696 is about 4069.1148914721. The cubic root of 16557696 is about 254.8785580903.

The spelling of 16557696 in words is "sixteen million, five hundred fifty-seven thousand, six hundred ninety-six".