6604425540 has 144 divisors (see below), whose sum is σ = 21407546160. Its totient is φ = 1642291200.

The previous prime is 6604425539. The next prime is 6604425563. The reversal of 6604425540 is 455244066.

6604425540 is a `hidden beast` number, since 6 + 60 + 4 + 42 + 554 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 286083396 + 6318342144 = 16914^2 + 79488^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6604425495 and 6604425504.

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, 323640 + ... + 343440.

It is an arithmetic number, because the mean of its divisors is an integer number (148663515).

Almost surely, 2^6604425540 is an apocalyptic number.

6604425540 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 6604425540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10703773080).

6604425540 is an abundant number, since it is smaller than the sum of its proper divisors (14803120620).

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

6604425540 is a wasteful number, since it uses less digits than its factorization.

6604425540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19942 (or 19937 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 6604425540 is about 81267.6167978365. The cubic root of 6604425540 is about 1876.1966206903.

The spelling of 6604425540 in words is "six billion, six hundred four million, four hundred twenty-five thousand, five hundred forty".