16616945 has 8 divisors (see below), whose sum is σ = 19979136. Its totient is φ = 13267696.

The previous prime is 16616933. The next prime is 16616947. The reversal of 16616945 is 54961661.

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 16616945 - 2²⁰ = 15568369 is a prime.

It is a super-2 number, since 2×16616945² = 552245722266050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16616899 and 16616908.

It is not an unprimeable number, because it can be changed into a prime (16616947) 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, 137 + ... + 5766.

It is an arithmetic number, because the mean of its divisors is an integer number (2497392).

Almost surely, 2^16616945 is an apocalyptic number.

It is an amenable number.

16616945 is a deficient number, since it is larger than the sum of its proper divisors (3362191).

16616945 is an equidigital number, since it uses as much as digits as its factorization.

16616945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6471.

The product of its digits is 38880, while the sum is 38.

The square root of 16616945 is about 4076.3887204240. The cubic root of 16616945 is about 255.1822098968.

The spelling of 16616945 in words is "sixteen million, six hundred sixteen thousand, nine hundred forty-five".