65216561100 has 144 divisors (see below), whose sum is σ = 202201308288. Its totient is φ = 16170767360.

The previous prime is 65216561087. The next prime is 65216561101. The reversal of 65216561100 is 116561256.

It is not an unprimeable number, because it can be changed into a prime (65216561101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 346267 + ... + 500333.

It is an arithmetic number, because the mean of its divisors is an integer number (1404175752).

Almost surely, 2^65216561100 is an apocalyptic number.

65216561100 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 65216561100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101100654144).

65216561100 is an abundant number, since it is smaller than the sum of its proper divisors (136984747188).

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

65216561100 is a wasteful number, since it uses less digits than its factorization.

65216561100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154184 (or 154177 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 65216561100 in words is "sixty-five billion, two hundred sixteen million, five hundred sixty-one thousand, one hundred".