65644321400 has 48 divisors (see below), whose sum is σ = 174426343440. Its totient is φ = 22506624000.

The previous prime is 65644321399. The next prime is 65644321409. The reversal of 65644321400 is 412344656.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65644321409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23443001 + ... + 23445800.

It is an arithmetic number, because the mean of its divisors is an integer number (3633882155).

Almost surely, 2^65644321400 is an apocalyptic number.

It is an amenable number.

65644321400 is an abundant number, since it is smaller than the sum of its proper divisors (108782022040).

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

65644321400 is a wasteful number, since it uses less digits than its factorization.

65644321400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46888824 (or 46888815 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 65644321400 in words is "sixty-five billion, six hundred forty-four million, three hundred twenty-one thousand, four hundred".