65128973868 has 108 divisors (see below), whose sum is σ = 199836851760. Its totient is φ = 17799211584.

The previous prime is 65128973863. The next prime is 65128973929. The reversal of 65128973868 is 86837982156.

65128973868 is a `hidden beast` number, since 6 + 512 + 89 + 7 + 38 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (65128973863) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 762063 + ... + 843206.

It is an arithmetic number, because the mean of its divisors is an integer number (1850341220).

Almost surely, 2^65128973868 is an apocalyptic number.

It is an amenable number.

65128973868 is an abundant number, since it is smaller than the sum of its proper divisors (134707877892).

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

65128973868 is a wasteful number, since it uses less digits than its factorization.

65128973868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605316 (or 1605304 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 65128973868 in words is "sixty-five billion, one hundred twenty-eight million, nine hundred seventy-three thousand, eight hundred sixty-eight".