65646312040 has 32 divisors (see below), whose sum is σ = 154126126080. Its totient is φ = 25116849472.

The previous prime is 65646312037. The next prime is 65646312071. The reversal of 65646312040 is 4021364656.

65646312040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35676424 + ... + 35678263.

It is an arithmetic number, because the mean of its divisors is an integer number (4816441440).

Almost surely, 2^65646312040 is an apocalyptic number.

It is an amenable number.

65646312040 is an abundant number, since it is smaller than the sum of its proper divisors (88479814040).

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

65646312040 is a wasteful number, since it uses less digits than its factorization.

65646312040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71354721 (or 71354717 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 65646312040 its reverse (4021364656), we get a palindrome (69667676696).

The spelling of 65646312040 in words is "sixty-five billion, six hundred forty-six million, three hundred twelve thousand, forty".