16616577 has 4 divisors (see below), whose sum is σ = 22155440. Its totient is φ = 11077716.

The previous prime is 16616573. The next prime is 16616581. The reversal of 16616577 is 77561661.

16616577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77561661 = 3 ⋅25853887.

It is an interprime number because it is at equal distance from previous prime (16616573) and next prime (16616581).

It is not a de Polignac number, because 16616577 - 2² = 16616573 is a prime.

It is a super-2 number, since 2×16616577² = 552221262393858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16616573) 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, 2769427 + ... + 2769432.

It is an arithmetic number, because the mean of its divisors is an integer number (5538860).

Almost surely, 2^16616577 is an apocalyptic number.

It is an amenable number.

16616577 is a deficient number, since it is larger than the sum of its proper divisors (5538863).

16616577 is an equidigital number, since it uses as much as digits as its factorization.

16616577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538862.

The product of its digits is 52920, while the sum is 39.

The square root of 16616577 is about 4076.3435821824. The cubic root of 16616577 is about 255.1803261220.

The spelling of 16616577 in words is "sixteen million, six hundred sixteen thousand, five hundred seventy-seven".