65621449820160 has 1152 divisors, whose sum is σ = 256441481936640. Its totient is φ = 15398355861504.

The previous prime is 65621449820149. The next prime is 65621449820161. The reversal of 65621449820160 is 6102894412656.

It is a happy number.

65621449820160 is a `hidden beast` number, since 6 + 5 + 62 + 1 + 449 + 82 + 0 + 1 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a junction number, because it is equal to n+sod(n) for n = 65621449820097 and 65621449820106.

It is not an unprimeable number, because it can be changed into a prime (65621449820161) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8459639002 + ... + 8459646758.

It is an arithmetic number, because the mean of its divisors is an integer number (222605453070).

Almost surely, 2^{65621449820160} is an apocalyptic number.

65621449820160 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 65621449820160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128220740968320).

65621449820160 is an abundant number, since it is smaller than the sum of its proper divisors (190820032116480).

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

65621449820160 is a wasteful number, since it uses less digits than its factorization.

65621449820160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133 (or 8110 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 65621449820160 in words is "sixty-five trillion, six hundred twenty-one billion, four hundred forty-nine million, eight hundred twenty thousand, one hundred sixty".