65643540253500 has 192 divisors, whose sum is σ = 208996083878400. Its totient is φ = 15878141440000.

The previous prime is 65643540253471. The next prime is 65643540253507. The reversal of 65643540253500 is 535204534656.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 65643540253500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65643540253507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2978215 + ... + 11838785.

It is an arithmetic number, because the mean of its divisors is an integer number (1088521270200).

Almost surely, 2^{65643540253500} is an apocalyptic number.

65643540253500 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 65643540253500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104498041939200).

65643540253500 is an abundant number, since it is smaller than the sum of its proper divisors (143352543624900).

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

65643540253500 is a wasteful number, since it uses less digits than its factorization.

65643540253500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8861053 (or 8861041 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 48.

The spelling of 65643540253500 in words is "sixty-five trillion, six hundred forty-three billion, five hundred forty million, two hundred fifty-three thousand, five hundred".