65666326644 has 96 divisors (see below), whose sum is σ = 171207388800. Its totient is φ = 21765427200.

The previous prime is 65666326603. The next prime is 65666326651. The reversal of 65666326644 is 44662366656.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 34542094 + ... + 34543994.

It is an arithmetic number, because the mean of its divisors is an integer number (1783410300).

Almost surely, 2^65666326644 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 65666326644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85603694400).

65666326644 is an abundant number, since it is smaller than the sum of its proper divisors (105541062156).

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

65666326644 is a wasteful number, since it uses less digits than its factorization.

65666326644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550 (or 3542 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 54.

The spelling of 65666326644 in words is "sixty-five billion, six hundred sixty-six million, three hundred twenty-six thousand, six hundred forty-four".