16651883323909 has 4 divisors (see below), whose sum is σ = 16651966185900. Its totient is φ = 16651800461920.

The previous prime is 16651883323861. The next prime is 16651883323913. The reversal of 16651883323909 is 90932338815661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8407117647009 + 8244765676900 = 2899503^2 + 2871370^2 .

It is a cyclic number.

It is not a de Polignac number, because 16651883323909 - 2¹⁷ = 16651883192837 is a prime.

It is a super-2 number, since 2×16651883323909² (a number of 27 digits) 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 (16651883323109) 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, 41128822 + ... + 41531719.

It is an arithmetic number, because the mean of its divisors is an integer number (4162991546475).

Almost surely, 2^{16651883323909} is an apocalyptic number.

It is an amenable number.

16651883323909 is a deficient number, since it is larger than the sum of its proper divisors (82861991).

16651883323909 is an equidigital number, since it uses as much as digits as its factorization.

16651883323909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82861990.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 16651883323909 in words is "sixteen trillion, six hundred fifty-one billion, eight hundred eighty-three million, three hundred twenty-three thousand, nine hundred nine".