16648997 has 4 divisors (see below), whose sum is σ = 17525280. Its totient is φ = 15772716.

The previous prime is 16648991. The next prime is 16648999. The reversal of 16648997 is 79984661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79984661 = 19 ⋅4209719.

It is a cyclic number.

It is not a de Polignac number, because 16648997 - 2⁴ = 16648981 is a prime.

It is a super-2 number, since 2×16648997² = 554378202212018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16648991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438113 + ... + 438150.

It is an arithmetic number, because the mean of its divisors is an integer number (4381320).

Almost surely, 2^16648997 is an apocalyptic number.

It is an amenable number.

16648997 is a deficient number, since it is larger than the sum of its proper divisors (876283).

16648997 is an equidigital number, since it uses as much as digits as its factorization.

16648997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876282.

The product of its digits is 653184, while the sum is 50.

The square root of 16648997 is about 4080.3182473920. The cubic root of 16648997 is about 255.3461759968.

The spelling of 16648997 in words is "sixteen million, six hundred forty-eight thousand, nine hundred ninety-seven".