5561621380 has 96 divisors (see below), whose sum is σ = 13487749632. Its totient is φ = 1886976000.

The previous prime is 5561621357. The next prime is 5561621389. The reversal of 5561621380 is 831261655.

It is not an unprimeable number, because it can be changed into a prime (5561621389) 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, 8813665 + ... + 8814295.

It is an arithmetic number, because the mean of its divisors is an integer number (140497392).

Almost surely, 2^5561621380 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 5561621380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6743874816).

5561621380 is an abundant number, since it is smaller than the sum of its proper divisors (7926128252).

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

5561621380 is a wasteful number, since it uses less digits than its factorization.

5561621380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 5561621380 is about 74576.2789364018. The cubic root of 5561621380 is about 1771.7419708809.

The spelling of 5561621380 in words is "five billion, five hundred sixty-one million, six hundred twenty-one thousand, three hundred eighty".