5561656380 has 72 divisors (see below), whose sum is σ = 19280413152. Its totient is φ = 1271235456.

The previous prime is 5561656367. The next prime is 5561656423. The reversal of 5561656380 is 836561655.

5561656380 is a `hidden beast` number, since 5 + 5 + 6 + 1 + 6 + 5 + 638 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2205747 + ... + 2208266.

It is an arithmetic number, because the mean of its divisors is an integer number (267783516).

Almost surely, 2^5561656380 is an apocalyptic number.

It is an amenable number.

5561656380 is an abundant number, since it is smaller than the sum of its proper divisors (13718756772).

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

5561656380 is a wasteful number, since it uses less digits than its factorization.

5561656380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414035 (or 4414030 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The square root of 5561656380 is about 74576.5135950991. The cubic root of 5561656380 is about 1771.7456874732.

The spelling of 5561656380 in words is "five billion, five hundred sixty-one million, six hundred fifty-six thousand, three hundred eighty".