1561104204216 has 64 divisors (see below), whose sum is σ = 4029119539200. Its totient is φ = 503524060800.

The previous prime is 1561104204157. The next prime is 1561104204217. The reversal of 1561104204216 is 6124024011651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561104204217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6601381 + ... + 6833771.

It is an arithmetic number, because the mean of its divisors is an integer number (62954992800).

Almost surely, 2^{1561104204216} is an apocalyptic number.

It is an amenable number.

1561104204216 is an abundant number, since it is smaller than the sum of its proper divisors (2468015334984).

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

1561104204216 is a wasteful number, since it uses less digits than its factorization.

1561104204216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241460 (or 241456 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

Adding to 1561104204216 its reverse (6124024011651), we get a palindrome (7685128215867).

The spelling of 1561104204216 in words is "one trillion, five hundred sixty-one billion, one hundred four million, two hundred four thousand, two hundred sixteen".