65655661616040 has 64 divisors (see below), whose sum is σ = 208553278080960. Its totient is φ = 16478283699200.

The previous prime is 65655661615963. The next prime is 65655661616047. The reversal of 65655661616040 is 4061616655656.

It is not an unprimeable number, because it can be changed into a prime (65655661616047) 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, 16092071886 + ... + 16092075965.

It is an arithmetic number, because the mean of its divisors is an integer number (3258644970015).

Almost surely, 2^{65655661616040} is an apocalyptic number.

65655661616040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65655661616040 is an abundant number, since it is smaller than the sum of its proper divisors (142897616464920).

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

65655661616040 is a wasteful number, since it uses less digits than its factorization.

65655661616040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32184147882 (or 32184147878 counting only the distinct ones).

The product of its (nonzero) digits is 23328000, while the sum is 57.

The spelling of 65655661616040 in words is "sixty-five trillion, six hundred fifty-five billion, six hundred sixty-one million, six hundred sixteen thousand, forty".