16561102404 has 96 divisors (see below), whose sum is σ = 48201302016. Its totient is φ = 4299482880.

The previous prime is 16561102403. The next prime is 16561102429. The reversal of 16561102404 is 40420116561.

It is a super-2 number, since 2×16561102404² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16561102403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3006717 + ... + 3012219.

It is an arithmetic number, because the mean of its divisors is an integer number (502096896).

Almost surely, 2^16561102404 is an apocalyptic number.

16561102404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16561102404 is an abundant number, since it is smaller than the sum of its proper divisors (31640199612).

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

16561102404 is a wasteful number, since it uses less digits than its factorization.

16561102404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8785 (or 8783 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 16561102404 its reverse (40420116561), we get a palindrome (56981218965).

The spelling of 16561102404 in words is "sixteen billion, five hundred sixty-one million, one hundred two thousand, four hundred four".