65440318648 has 32 divisors (see below), whose sum is σ = 126953568000. Its totient is φ = 31586423680.

The previous prime is 65440318621. The next prime is 65440318661. The reversal of 65440318648 is 84681304456.

It is a congruent number.

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, 1537818 + ... + 1579798.

It is an arithmetic number, because the mean of its divisors is an integer number (3967299000).

Almost surely, 2^65440318648 is an apocalyptic number.

It is an amenable number.

65440318648 is a deficient number, since it is larger than the sum of its proper divisors (61513249352).

65440318648 is a wasteful number, since it uses less digits than its factorization.

65440318648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48735 (or 48731 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 49.

The spelling of 65440318648 in words is "sixty-five billion, four hundred forty million, three hundred eighteen thousand, six hundred forty-eight".