65109952500 has 240 divisors, whose sum is σ = 200370360960. Its totient is φ = 16417280000.

The previous prime is 65109952493. The next prime is 65109952513. The reversal of 65109952500 is 525990156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 15350380 + ... + 15354620.

It is an arithmetic number, because the mean of its divisors is an integer number (834876504).

Almost surely, 2^65109952500 is an apocalyptic number.

65109952500 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 65109952500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100185180480).

65109952500 is an abundant number, since it is smaller than the sum of its proper divisors (135260408460).

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

65109952500 is a wasteful number, since it uses less digits than its factorization.

65109952500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380 (or 4363 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 42.

The spelling of 65109952500 in words is "sixty-five billion, one hundred nine million, nine hundred fifty-two thousand, five hundred".