65645860428 has 96 divisors (see below), whose sum is σ = 174897213120. Its totient is φ = 21277831680.

The previous prime is 65645860421. The next prime is 65645860429. The reversal of 65645860428 is 82406854656.

65645860428 is a `hidden beast` number, since 6 + 5 + 6 + 4 + 5 + 8 + 604 + 28 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (65645860421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8551600 + ... + 8559272.

It is an arithmetic number, because the mean of its divisors is an integer number (1821845970).

Almost surely, 2^65645860428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65645860428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87448606560).

65645860428 is an abundant number, since it is smaller than the sum of its proper divisors (109251352692).

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

65645860428 is a wasteful number, since it uses less digits than its factorization.

65645860428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864 (or 9856 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 54.

The spelling of 65645860428 in words is "sixty-five billion, six hundred forty-five million, eight hundred sixty thousand, four hundred twenty-eight".