5521345578 has 108 divisors (see below), whose sum is σ = 14783470182. Its totient is φ = 1484663040.

The previous prime is 5521345547. The next prime is 5521345579. The reversal of 5521345578 is 8755431255.

5521345578 is a `hidden beast` number, since 5 + 521 + 3 + 4 + 55 + 78 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 5319222489 + 202123089 = 72933^2 + 14217^2 .

It is not an unprimeable number, because it can be changed into a prime (5521345579) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 244068 + ... + 265728.

Almost surely, 2^5521345578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5521345578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7391735091).

5521345578 is an abundant number, since it is smaller than the sum of its proper divisors (9262124604).

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

5521345578 is a wasteful number, since it uses less digits than its factorization.

5521345578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21717 (or 21690 counting only the distinct ones).

The product of its digits is 840000, while the sum is 45.

The square root of 5521345578 is about 74305.7573677841. The cubic root of 5521345578 is about 1767.4547751720.

The spelling of 5521345578 in words is "five billion, five hundred twenty-one million, three hundred forty-five thousand, five hundred seventy-eight".