65187781767680 has 640 divisors, whose sum is σ = 188640247251456. Its totient is φ = 21467587215360.

The previous prime is 65187781767673. The next prime is 65187781767701. The reversal of 65187781767680 is 8676718778156.

It is a tau number, because it is divible by the number of its divisors (640).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2347657157 + ... + 2347684923.

Almost surely, 2^{65187781767680} 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 65187781767680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94320123625728).

65187781767680 is an abundant number, since it is smaller than the sum of its proper divisors (123452465483776).

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

65187781767680 is a wasteful number, since it uses less digits than its factorization.

65187781767680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27889 (or 27851 counting only the distinct ones).

The product of its (nonzero) digits is 1327656960, while the sum is 77.

The spelling of 65187781767680 in words is "sixty-five trillion, one hundred eighty-seven billion, seven hundred eighty-one million, seven hundred sixty-seven thousand, six hundred eighty".