65525405040 has 240 divisors, whose sum is σ = 223927730208. Its totient is φ = 17167417344.

The previous prime is 65525405027. The next prime is 65525405069. The reversal of 65525405040 is 4050452556.

65525405040 is a `hidden beast` number, since 6 + 5 + 525 + 40 + 50 + 40 = 666.

65525405040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65525404986 and 65525405004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20886352 + ... + 20889488.

Almost surely, 2^65525405040 is an apocalyptic number.

65525405040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65525405040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111963865104).

65525405040 is an abundant number, since it is smaller than the sum of its proper divisors (158402325168).

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

65525405040 is a wasteful number, since it uses less digits than its factorization.

65525405040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656 (or 3647 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

Adding to 65525405040 its reverse (4050452556), we get a palindrome (69575857596).

The spelling of 65525405040 in words is "sixty-five billion, five hundred twenty-five million, four hundred five thousand, forty".