1016561104 has 80 divisors (see below), whose sum is σ = 2364223680. Its totient is φ = 418314240.

The previous prime is 1016561101. The next prime is 1016561111. The reversal of 1016561104 is 4011656101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016561101) 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, 59619 + ... + 74749.

It is an arithmetic number, because the mean of its divisors is an integer number (29552796).

Almost surely, 2^1016561104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1016561104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182111840).

1016561104 is an abundant number, since it is smaller than the sum of its proper divisors (1347662576).

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

1016561104 is a wasteful number, since it uses less digits than its factorization.

1016561104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15188 (or 15182 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1016561104 is about 31883.5553851825. Note that the first 3 decimals coincide. The cubic root of 1016561104 is about 1005.4901708624.

The spelling of 1016561104 in words is "one billion, sixteen million, five hundred sixty-one thousand, one hundred four".