65643195744 has 252 divisors, whose sum is σ = 225402775164. Its totient is φ = 18754872192.

The previous prime is 65643195697. The next prime is 65643195809. The reversal of 65643195744 is 44759134656.

It is a happy number.

65643195744 is a `hidden beast` number, since 6 + 5 + 64 + 3 + 1 + 9 + 574 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 1114359 + ... + 1171785.

It is an arithmetic number, because the mean of its divisors is an integer number (894455457).

Almost surely, 2^65643195744 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 65643195744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112701387582).

65643195744 is an abundant number, since it is smaller than the sum of its proper divisors (159759579420).

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

65643195744 is an equidigital number, since it uses as much as digits as its factorization.

65643195744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57469 (or 57439 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 65643195744 in words is "sixty-five billion, six hundred forty-three million, one hundred ninety-five thousand, seven hundred forty-four".