65520000000 has 1056 divisors, whose sum is σ = 291057067392. Its totient is φ = 13824000000.

The previous prime is 65519999917. The next prime is 65520000047. The reversal of 65520000000 is 2556.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 10.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 6500 × 6300 × 1600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5039999994 + ... + 5040000006.

Almost surely, 2^65520000000 is an apocalyptic number.

65520000000 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 65520000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145528533696).

65520000000 is an abundant number, since it is smaller than the sum of its proper divisors (225537067392).

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

65520000000 is an frugal number, since it uses more digits than its factorization.

65520000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

Adding to 65520000000 its reverse (2556), we get a palindrome (65520002556).

The spelling of 65520000000 in words is "sixty-five billion, five hundred twenty million", and thus it is an aban number.