65646925680 has 320 divisors, whose sum is σ = 244480923648. Its totient is φ = 14246707200.

The previous prime is 65646925651. The next prime is 65646925681. The reversal of 65646925680 is 8652964656.

It is a self number, because there is not a number n which added to its sum of digits gives 65646925680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65646925681) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 5287480 + ... + 5299880.

Almost surely, 2^65646925680 is an apocalyptic number.

65646925680 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 65646925680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122240461824).

65646925680 is an abundant number, since it is smaller than the sum of its proper divisors (178833997968).

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

65646925680 is a wasteful number, since it uses less digits than its factorization.

65646925680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12584 (or 12578 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 57.

The spelling of 65646925680 in words is "sixty-five billion, six hundred forty-six million, nine hundred twenty-five thousand, six hundred eighty".