65634632420 has 96 divisors (see below), whose sum is σ = 159906700800. Its totient is φ = 22164747264.

The previous prime is 65634632389. The next prime is 65634632449. The reversal of 65634632420 is 2423643656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3266966 + ... + 3286994.

It is an arithmetic number, because the mean of its divisors is an integer number (1665694800).

Almost surely, 2^65634632420 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 65634632420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79953350400).

65634632420 is an abundant number, since it is smaller than the sum of its proper divisors (94272068380).

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

65634632420 is a wasteful number, since it uses less digits than its factorization.

65634632420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20397 (or 20395 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 65634632420 in words is "sixty-five billion, six hundred thirty-four million, six hundred thirty-two thousand, four hundred twenty".