16675221209 has 8 divisors (see below), whose sum is σ = 16919458920. Its totient is φ = 16432459776.

The previous prime is 16675221203. The next prime is 16675221247. The reversal of 16675221209 is 90212257661.

It can be written as a sum of positive squares in 4 ways, for example, as 85008400 + 16590212809 = 9220^2 + 128803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16675221209 - 2¹² = 16675217113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16675221203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346304 + ... + 391505.

It is an arithmetic number, because the mean of its divisors is an integer number (2114932365).

Almost surely, 2^16675221209 is an apocalyptic number.

It is an amenable number.

16675221209 is a deficient number, since it is larger than the sum of its proper divisors (244237711).

16675221209 is an equidigital number, since it uses as much as digits as its factorization.

16675221209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738139.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 16675221209 in words is "sixteen billion, six hundred seventy-five million, two hundred twenty-one thousand, two hundred nine".