65221975104 has 448 divisors, whose sum is σ = 213100554240. Its totient is φ = 17323130880.

The previous prime is 65221975103. The next prime is 65221975129. The reversal of 65221975104 is 40157912256.

It is not an unprimeable number, because it can be changed into a prime (65221975103) 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, 113036064 + ... + 113036640.

It is an arithmetic number, because the mean of its divisors is an integer number (475670880).

Almost surely, 2^65221975104 is an apocalyptic number.

65221975104 is a gapful number since it is divisible by the number (64) 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 65221975104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106550277120).

65221975104 is an abundant number, since it is smaller than the sum of its proper divisors (147878579136).

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

65221975104 is a wasteful number, since it uses less digits than its factorization.

65221975104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 65221975104 in words is "sixty-five billion, two hundred twenty-one million, nine hundred seventy-five thousand, one hundred four".