16605605617 has 16 divisors (see below), whose sum is σ = 17544144960. Its totient is φ = 15673649472.

The previous prime is 16605605563. The next prime is 16605605629. The reversal of 16605605617 is 71650650661.

It is a cyclic number.

It is not a de Polignac number, because 16605605617 - 2¹⁹ = 16605081329 is a prime.

It is a super-2 number, since 2×16605605617² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16605600617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7240723 + ... + 7243015.

It is an arithmetic number, because the mean of its divisors is an integer number (1096509060).

Almost surely, 2^16605605617 is an apocalyptic number.

It is an amenable number.

16605605617 is a deficient number, since it is larger than the sum of its proper divisors (938539343).

16605605617 is a wasteful number, since it uses less digits than its factorization.

16605605617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 16605605617 in words is "sixteen billion, six hundred five million, six hundred five thousand, six hundred seventeen".