16810661 has 8 divisors (see below), whose sum is σ = 19297920. Its totient is φ = 14344848.

The previous prime is 16810657. The next prime is 16810667. The reversal of 16810661 is 16601861.

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

It is not a de Polignac number, because 16810661 - 2² = 16810657 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 (16810667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3641 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (2412240).

Almost surely, 2^16810661 is an apocalyptic number.

It is an amenable number.

16810661 is a deficient number, since it is larger than the sum of its proper divisors (2487259).

16810661 is a wasteful number, since it uses less digits than its factorization.

16810661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10723.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16810661 is about 4100.0806089637. The cubic root of 16810661 is about 256.1699971549.

It can be divided in two parts, 16810 and 661, that added together give a palindrome (17471).

The spelling of 16810661 in words is "sixteen million, eight hundred ten thousand, six hundred sixty-one".