65640445512 has 32 divisors (see below), whose sum is σ = 164414914080. Its totient is φ = 21838308480.

The previous prime is 65640445489. The next prime is 65640445517. The reversal of 65640445512 is 21554404656.

65640445512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (65640445517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2602189 + ... + 2627292.

It is an arithmetic number, because the mean of its divisors is an integer number (5137966065).

Almost surely, 2^65640445512 is an apocalyptic number.

It is an amenable number.

65640445512 is an abundant number, since it is smaller than the sum of its proper divisors (98774468568).

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

65640445512 is a wasteful number, since it uses less digits than its factorization.

65640445512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5230013 (or 5230009 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 65640445512 in words is "sixty-five billion, six hundred forty million, four hundred forty-five thousand, five hundred twelve".