65583553408 has 64 divisors (see below), whose sum is σ = 133753738320. Its totient is φ = 32019886080.

The previous prime is 65583553403. The next prime is 65583553459. The reversal of 65583553408 is 80435538556.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65583553403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1408516 + ... + 1454332.

Almost surely, 2^65583553408 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 65583553408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66876869160).

65583553408 is an abundant number, since it is smaller than the sum of its proper divisors (68170184912).

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

65583553408 is a wasteful number, since it uses less digits than its factorization.

65583553408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46095 (or 46083 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 52.

The spelling of 65583553408 in words is "sixty-five billion, five hundred eighty-three million, five hundred fifty-three thousand, four hundred eight".