65128063769840 has 80 divisors (see below), whose sum is σ = 155130363271296. Its totient is φ = 25413474048000.

The previous prime is 65128063769831. The next prime is 65128063769863. The reversal of 65128063769840 is 4896736082156.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34683065 + ... + 36512615.

It is a 1-persistent number, because it is pandigital, but 2⋅65128063769840 = 130256127539680 is not.

Almost surely, 2^{65128063769840} is an apocalyptic number.

It is an amenable number.

65128063769840 is an abundant number, since it is smaller than the sum of its proper divisors (90002299501456).

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

65128063769840 is a wasteful number, since it uses less digits than its factorization.

65128063769840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840458 (or 1840452 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 65.

The spelling of 65128063769840 in words is "sixty-five trillion, one hundred twenty-eight billion, sixty-three million, seven hundred sixty-nine thousand, eight hundred forty".