65690140128 has 24 divisors (see below), whose sum is σ = 172436618088. Its totient is φ = 21896713344.

The previous prime is 65690140097. The next prime is 65690140133. The reversal of 65690140128 is 82104109656.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65690140128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342136051 + ... + 342136242.

It is an arithmetic number, because the mean of its divisors is an integer number (7184859087).

Almost surely, 2^65690140128 is an apocalyptic number.

It is an amenable number.

65690140128 is an abundant number, since it is smaller than the sum of its proper divisors (106746477960).

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

65690140128 is a wasteful number, since it uses less digits than its factorization.

65690140128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684272306 (or 684272298 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 65690140128 in words is "sixty-five billion, six hundred ninety million, one hundred forty thousand, one hundred twenty-eight".