65683621640 has 64 divisors (see below), whose sum is σ = 181893116160. Its totient is φ = 20787782400.

The previous prime is 65683621639. The next prime is 65683621643. The reversal of 65683621640 is 4612638656.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (65683621643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9018836 + ... + 9026115.

It is an arithmetic number, because the mean of its divisors is an integer number (2842079940).

Almost surely, 2^65683621640 is an apocalyptic number.

It is an amenable number.

65683621640 is an abundant number, since it is smaller than the sum of its proper divisors (116209494520).

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

65683621640 is a wasteful number, since it uses less digits than its factorization.

65683621640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044982 (or 18044978 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 65683621640 in words is "sixty-five billion, six hundred eighty-three million, six hundred twenty-one thousand, six hundred forty".