6561524880 has 240 divisors, whose sum is σ = 22932698880. Its totient is φ = 1745960832.

The previous prime is 6561524819. The next prime is 6561524903. The reversal of 6561524880 is 884251656.

6561524880 is a `hidden beast` number, since 6 + 5 + 615 + 24 + 8 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14171529 + ... + 14171991.

It is an arithmetic number, because the mean of its divisors is an integer number (95552912).

Almost surely, 2^6561524880 is an apocalyptic number.

6561524880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6561524880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11466349440).

6561524880 is an abundant number, since it is smaller than the sum of its proper divisors (16371174000).

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

6561524880 is an frugal number, since it uses more digits than its factorization.

6561524880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 6561524880 is about 81003.2399352026. The cubic root of 6561524880 is about 1872.1253614273.

It can be divided in two parts, 6561 and 524880, that added together give a 12-th power (531441 = 3¹²).

The spelling of 6561524880 in words is "six billion, five hundred sixty-one million, five hundred twenty-four thousand, eight hundred eighty".