16616608345 has 4 divisors (see below), whose sum is σ = 19939930020. Its totient is φ = 13293286672.

The previous prime is 16616608343. The next prime is 16616608357. The reversal of 16616608345 is 54380661661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54380661661 = 487 ⋅111664603.

It can be written as a sum of positive squares in 2 ways, for example, as 8832428361 + 7784179984 = 93981^2 + 88228^2 .

It is a cyclic number.

It is not a de Polignac number, because 16616608345 - 2¹ = 16616608343 is a prime.

It is a super-2 number, since 2×16616608345² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16616608295 and 16616608304.

It is not an unprimeable number, because it can be changed into a prime (16616608343) 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, 1661660830 + ... + 1661660839.

It is an arithmetic number, because the mean of its divisors is an integer number (4984982505).

Almost surely, 2^16616608345 is an apocalyptic number.

It is an amenable number.

16616608345 is a deficient number, since it is larger than the sum of its proper divisors (3323321675).

16616608345 is an equidigital number, since it uses as much as digits as its factorization.

16616608345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323321674.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 16616608345 in words is "sixteen billion, six hundred sixteen million, six hundred eight thousand, three hundred forty-five".