65144405326440 has 256 divisors, whose sum is σ = 224289762048000. Its totient is φ = 14989569889280.

The previous prime is 65144405326409. The next prime is 65144405326457. The reversal of 65144405326440 is 4462350444156.

It is a self number, because there is not a number n which added to its sum of digits gives 65144405326440.

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, 12163404 + ... + 16680443.

It is an arithmetic number, because the mean of its divisors is an integer number (876131883000).

Almost surely, 2^{65144405326440} is an apocalyptic number.

65144405326440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65144405326440 is an abundant number, since it is smaller than the sum of its proper divisors (159145356721560).

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

65144405326440 is a wasteful number, since it uses less digits than its factorization.

65144405326440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28843960 (or 28843956 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 48.

The spelling of 65144405326440 in words is "sixty-five trillion, one hundred forty-four billion, four hundred five million, three hundred twenty-six thousand, four hundred forty".