65405756668 has 96 divisors (see below), whose sum is σ = 135082321920. Its totient is φ = 27130844160.

The previous prime is 65405756623. The next prime is 65405756671. The reversal of 65405756668 is 86665750456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61644858 + ... + 61645918.

It is an arithmetic number, because the mean of its divisors is an integer number (1407107520).

Almost surely, 2^65405756668 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 65405756668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67541160960).

65405756668 is an abundant number, since it is smaller than the sum of its proper divisors (69676565252).

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

65405756668 is a wasteful number, since it uses less digits than its factorization.

65405756668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595 (or 1593 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 58.

The spelling of 65405756668 in words is "sixty-five billion, four hundred five million, seven hundred fifty-six thousand, six hundred sixty-eight".