65778436480 has 64 divisors (see below), whose sum is σ = 157561297200. Its totient is φ = 26259552256.

The previous prime is 65778436433. The next prime is 65778436531. The reversal of 65778436480 is 8463487756.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224799 + ... + 426721.

Almost surely, 2^65778436480 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 65778436480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78780648600).

65778436480 is an abundant number, since it is smaller than the sum of its proper divisors (91782860720).

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

65778436480 is a wasteful number, since it uses less digits than its factorization.

65778436480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202451 (or 202439 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 58.

The spelling of 65778436480 in words is "sixty-five billion, seven hundred seventy-eight million, four hundred thirty-six thousand, four hundred eighty".