16651641 has 4 divisors (see below), whose sum is σ = 22202192. Its totient is φ = 11101092.

The previous prime is 16651639. The next prime is 16651667. The reversal of 16651641 is 14615661.

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.

It is not a de Polignac number, because 16651641 - 2¹ = 16651639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16651599 and 16651608.

It is not an unprimeable number, because it can be changed into a prime (16651631) 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, 2775271 + ... + 2775276.

It is an arithmetic number, because the mean of its divisors is an integer number (5550548).

Almost surely, 2^16651641 is an apocalyptic number.

It is an amenable number.

16651641 is a deficient number, since it is larger than the sum of its proper divisors (5550551).

16651641 is an equidigital number, since it uses as much as digits as its factorization.

16651641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550550.

The product of its digits is 4320, while the sum is 30.

The square root of 16651641 is about 4080.6422288655. The cubic root of 16651641 is about 255.3596923176.

The spelling of 16651641 in words is "sixteen million, six hundred fifty-one thousand, six hundred forty-one".