65221425500 has 144 divisors (see below), whose sum is σ = 180764045280. Its totient is φ = 20328672000.

The previous prime is 65221425461. The next prime is 65221425527. The reversal of 65221425500 is 552412256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148496 + ... + 390504.

It is an arithmetic number, because the mean of its divisors is an integer number (1255305870).

Almost surely, 2^65221425500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65221425500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90382022640).

65221425500 is an abundant number, since it is smaller than the sum of its proper divisors (115542619780).

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

65221425500 is a wasteful number, since it uses less digits than its factorization.

65221425500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242053 (or 242034 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 65221425500 its reverse (552412256), we get a palindrome (65773837756).

The spelling of 65221425500 in words is "sixty-five billion, two hundred twenty-one million, four hundred twenty-five thousand, five hundred".