65401012320 has 384 divisors, whose sum is σ = 238551505920. Its totient is φ = 14752972800.

The previous prime is 65401012319. The next prime is 65401012421. The reversal of 65401012320 is 2321010456.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 108820020 + ... + 108820620.

It is an arithmetic number, because the mean of its divisors is an integer number (621227880).

Almost surely, 2^65401012320 is an apocalyptic number.

65401012320 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 65401012320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119275752960).

65401012320 is an abundant number, since it is smaller than the sum of its proper divisors (173150493600).

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

65401012320 is a wasteful number, since it uses less digits than its factorization.

65401012320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 65401012320 its reverse (2321010456), we get a palindrome (67722022776).

The spelling of 65401012320 in words is "sixty-five billion, four hundred one million, twelve thousand, three hundred twenty".