16561868 has 12 divisors (see below), whose sum is σ = 29690472. Its totient is φ = 8078880.

The previous prime is 16561861. The next prime is 16561889. The reversal of 16561868 is 86816561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (16561861) 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, 50330 + ... + 50657.

It is an arithmetic number, because the mean of its divisors is an integer number (2474206).

Almost surely, 2^16561868 is an apocalyptic number.

It is an amenable number.

16561868 is a deficient number, since it is larger than the sum of its proper divisors (13128604).

16561868 is a wasteful number, since it uses less digits than its factorization.

16561868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101032 (or 101030 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 16561868 is about 4069.6275013814. The cubic root of 16561868 is about 254.8999633238.

The spelling of 16561868 in words is "sixteen million, five hundred sixty-one thousand, eight hundred sixty-eight".