65604471660 has 432 divisors, whose sum is σ = 250958844864. Its totient is φ = 13578319872.

The previous prime is 65604471637. The next prime is 65604471671. The reversal of 65604471660 is 6617440656.

65604471660 is a `hidden beast` number, since 65 + 60 + 4 + 471 + 6 + 60 = 666.

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

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 11282914 + ... + 11288726.

It is an arithmetic number, because the mean of its divisors is an integer number (580923252).

Almost surely, 2^65604471660 is an apocalyptic number.

65604471660 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 65604471660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125479422432).

65604471660 is an abundant number, since it is smaller than the sum of its proper divisors (185354373204).

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

65604471660 is a wasteful number, since it uses less digits than its factorization.

65604471660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5914 (or 5896 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 65604471660 in words is "sixty-five billion, six hundred four million, four hundred seventy-one thousand, six hundred sixty".