65326878804040 has 128 divisors (see below), whose sum is σ = 176959943654400. Its totient is φ = 21202719010560.

The previous prime is 65326878803987. The next prime is 65326878804049. The reversal of 65326878804040 is 4040887862356.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 65326878804040.

It is not an unprimeable number, because it can be changed into a prime (65326878804049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2255655 + ... + 11650825.

It is an arithmetic number, because the mean of its divisors is an integer number (1382499559800).

Almost surely, 2^{65326878804040} 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 65326878804040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88479971827200).

65326878804040 is an abundant number, since it is smaller than the sum of its proper divisors (111633064850360).

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

65326878804040 is a wasteful number, since it uses less digits than its factorization.

65326878804040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396515 (or 9396511 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 61.

The spelling of 65326878804040 in words is "sixty-five trillion, three hundred twenty-six billion, eight hundred seventy-eight million, eight hundred four thousand, forty".