16561002 has 16 divisors (see below), whose sum is σ = 33292512. Its totient is φ = 5491920.

The previous prime is 16560983. The next prime is 16561003. The reversal of 16561002 is 20016561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16561002.

It is not an unprimeable number, because it can be changed into a prime (16561003) 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, 5824 + ... + 8187.

It is an arithmetic number, because the mean of its divisors is an integer number (2080782).

Almost surely, 2^16561002 is an apocalyptic number.

16561002 is an abundant number, since it is smaller than the sum of its proper divisors (16731510).

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

16561002 is a wasteful number, since it uses less digits than its factorization.

16561002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14213.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 16561002 is about 4069.5211020463. The cubic root of 16561002 is about 254.8955204430.

Adding to 16561002 its reverse (20016561), we get a palindrome (36577563).

The spelling of 16561002 in words is "sixteen million, five hundred sixty-one thousand, two".