66325959648 has 672 divisors, whose sum is σ = 226831461696. Its totient is φ = 18919194624.

The previous prime is 66325959647. The next prime is 66325959683. The reversal of 66325959648 is 84695952366.

66325959648 is a `hidden beast` number, since 6 + 6 + 32 + 5 + 9 + 596 + 4 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66325959647) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 258077536 + ... + 258077792.

It is an arithmetic number, because the mean of its divisors is an integer number (337546818).

Almost surely, 2^66325959648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66325959648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113415730848).

66325959648 is an abundant number, since it is smaller than the sum of its proper divisors (160505502048).

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

66325959648 is a wasteful number, since it uses less digits than its factorization.

66325959648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 335 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 63.

The spelling of 66325959648 in words is "sixty-six billion, three hundred twenty-five million, nine hundred fifty-nine thousand, six hundred forty-eight".