16605465221 has 8 divisors (see below), whose sum is σ = 17196787200. Its totient is φ = 16015391280.

The previous prime is 16605465199. The next prime is 16605465263. The reversal of 16605465221 is 12256450661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16605465221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16605465521) 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, 284885 + ... + 338186.

It is an arithmetic number, because the mean of its divisors is an integer number (2149598400).

Almost surely, 2^16605465221 is an apocalyptic number.

It is an amenable number.

16605465221 is a deficient number, since it is larger than the sum of its proper divisors (591321979).

16605465221 is an equidigital number, since it uses as much as digits as its factorization.

16605465221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624019.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 16605465221 in words is "sixteen billion, six hundred five million, four hundred sixty-five thousand, two hundred twenty-one".