5661113556 has 96 divisors (see below), whose sum is σ = 15773829120. Its totient is φ = 1545058944.

The previous prime is 5661113551. The next prime is 5661113561. The reversal of 5661113556 is 6553111665.

It is an interprime number because it is at equal distance from previous prime (5661113551) and next prime (5661113561).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661113551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1924735 + ... + 1927673.

It is an arithmetic number, because the mean of its divisors is an integer number (164310720).

Almost surely, 2^5661113556 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 5661113556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7886914560).

5661113556 is an abundant number, since it is smaller than the sum of its proper divisors (10112715564).

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

5661113556 is a wasteful number, since it uses less digits than its factorization.

5661113556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973 (or 3971 counting only the distinct ones).

The product of its digits is 81000, while the sum is 39.

The square root of 5661113556 is about 75240.3718491609. The cubic root of 5661113556 is about 1782.2445232492.

The spelling of 5661113556 in words is "five billion, six hundred sixty-one million, one hundred thirteen thousand, five hundred fifty-six".