65939825556 has 324 divisors, whose sum is σ = 198341688636. Its totient is φ = 18393323520.

The previous prime is 65939825537. The next prime is 65939825569. The reversal of 65939825556 is 65552893956.

65939825556 is a `hidden beast` number, since 6 + 59 + 3 + 9 + 8 + 25 + 556 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 700449156 + 65239376400 = 26466^2 + 255420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65939825493 and 65939825502.

It is a congruent number.

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 107 ways as a sum of consecutive naturals, for example, 208011910 + ... + 208012226.

Almost surely, 2^65939825556 is an apocalyptic number.

65939825556 is a gapful number since it is divisible by the number (66) 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 65939825556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99170844318).

65939825556 is an abundant number, since it is smaller than the sum of its proper divisors (132401863080).

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

65939825556 is a wasteful number, since it uses less digits than its factorization.

65939825556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 403 counting only the distinct ones).

The product of its digits is 87480000, while the sum is 63.

The spelling of 65939825556 in words is "sixty-five billion, nine hundred thirty-nine million, eight hundred twenty-five thousand, five hundred fifty-six".