65244621312 has 720 divisors, whose sum is σ = 220786806240. Its totient is φ = 19201867776.

The previous prime is 65244621251. The next prime is 65244621313. The reversal of 65244621312 is 21312644256.

65244621312 is a `hidden beast` number, since 6 + 5 + 24 + 4 + 621 + 3 + 1 + 2 = 666.

It is a super-2 number, since 2×65244621312² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65244621313) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 609762763 + ... + 609762869.

It is an arithmetic number, because the mean of its divisors is an integer number (306648342).

Almost surely, 2^65244621312 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 65244621312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110393403120).

65244621312 is an abundant number, since it is smaller than the sum of its proper divisors (155542184928).

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

65244621312 is a wasteful number, since it uses less digits than its factorization.

65244621312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 154 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 65244621312 in words is "sixty-five billion, two hundred forty-four million, six hundred twenty-one thousand, three hundred twelve".