65401216513644 has 96 divisors (see below), whose sum is σ = 170668529176320. Its totient is φ = 19320168985600.

The previous prime is 65401216513579. The next prime is 65401216513679. The reversal of 65401216513644 is 44631561210456.

It is a junction number, because it is equal to n+sod(n) for n = 65401216513593 and 65401216513602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2288527 + ... + 11663609.

It is an arithmetic number, because the mean of its divisors is an integer number (1777797178920).

Almost surely, 2^{65401216513644} 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 65401216513644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85334264588160).

65401216513644 is an abundant number, since it is smaller than the sum of its proper divisors (105267312662676).

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

65401216513644 is a wasteful number, since it uses less digits than its factorization.

65401216513644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9376431 (or 9376429 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 65401216513644 in words is "sixty-five trillion, four hundred one billion, two hundred sixteen million, five hundred thirteen thousand, six hundred forty-four".