65511779328 has 132 divisors (see below), whose sum is σ = 189614232288. Its totient is φ = 21785272320.

The previous prime is 65511779327. The next prime is 65511779339. The reversal of 65511779328 is 82397711556.

65511779328 is a `hidden beast` number, since 6 + 551 + 17 + 79 + 3 + 2 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (65511779323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3963850 + ... + 3980342.

Almost surely, 2^65511779328 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 65511779328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94807116144).

65511779328 is an abundant number, since it is smaller than the sum of its proper divisors (124102452960).

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

65511779328 is a wasteful number, since it uses less digits than its factorization.

65511779328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16950 (or 16929 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The spelling of 65511779328 in words is "sixty-five billion, five hundred eleven million, seven hundred seventy-nine thousand, three hundred twenty-eight".