65545747660800 has 2592 divisors, whose sum is σ = 274111337955780. Its totient is φ = 14847049728000.

The previous prime is 65545747660741. The next prime is 65545747660819. The reversal of 65545747660800 is 806674754556.

65545747660800 is a `hidden beast` number, since 6 + 5 + 5 + 457 + 47 + 6 + 60 + 80 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 161 ways as a sum of consecutive naturals, for example, 2114378956785 + ... + 2114378956815.

Almost surely, 2^{65545747660800} is an apocalyptic number.

65545747660800 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 65545747660800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137055668977890).

65545747660800 is an abundant number, since it is smaller than the sum of its proper divisors (208565590294980).

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

65545747660800 is a wasteful number, since it uses less digits than its factorization.

65545747660800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 169344000, while the sum is 63.

The spelling of 65545747660800 in words is "sixty-five trillion, five hundred forty-five billion, seven hundred forty-seven million, six hundred sixty thousand, eight hundred".