16561410 has 16 divisors (see below), whose sum is σ = 39747456. Its totient is φ = 4416368.

The previous prime is 16561399. The next prime is 16561411. The reversal of 16561410 is 1416561.

16561410 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16561411) 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, 275994 + ... + 276053.

It is an arithmetic number, because the mean of its divisors is an integer number (2484216).

Almost surely, 2^16561410 is an apocalyptic number.

16561410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16561410 is an abundant number, since it is smaller than the sum of its proper divisors (23186046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16561410 is a wasteful number, since it uses less digits than its factorization.

16561410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552057.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 16561410 is about 4069.5712304861. The cubic root of 16561410 is about 254.8976136440.

Adding to 16561410 its reverse (1416561), we get a palindrome (17977971).

The spelling of 16561410 in words is "sixteen million, five hundred sixty-one thousand, four hundred ten".