16561621122 has 16 divisors (see below), whose sum is σ = 33314708160. Its totient is φ = 5488629392.

The previous prime is 16561621093. The next prime is 16561621123. The reversal of 16561621122 is 22112616561.

It is not an unprimeable number, because it can be changed into a prime (16561621123) 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, 7976622 + ... + 7978697.

It is an arithmetic number, because the mean of its divisors is an integer number (2082169260).

Almost surely, 2^16561621122 is an apocalyptic number.

16561621122 is an abundant number, since it is smaller than the sum of its proper divisors (16753087038).

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

16561621122 is a wasteful number, since it uses less digits than its factorization.

16561621122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15955497.

The product of its digits is 8640, while the sum is 33.

The spelling of 16561621122 in words is "sixteen billion, five hundred sixty-one million, six hundred twenty-one thousand, one hundred twenty-two".