65440110021 has 128 divisors (see below), whose sum is σ = 108550471680. Its totient is φ = 34522675200.

The previous prime is 65440110019. The next prime is 65440110037. The reversal of 65440110021 is 12001104456.

It is a happy number.

It is not a de Polignac number, because 65440110021 - 2¹ = 65440110019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65440109973 and 65440110000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65440110041) 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 127 ways as a sum of consecutive naturals, for example, 160000065 + ... + 160000473.

It is an arithmetic number, because the mean of its divisors is an integer number (848050560).

Almost surely, 2^65440110021 is an apocalyptic number.

It is an amenable number.

65440110021 is a deficient number, since it is larger than the sum of its proper divisors (43110361659).

65440110021 is a wasteful number, since it uses less digits than its factorization.

65440110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 65440110021 its reverse (12001104456), we get a palindrome (77441214477).

The spelling of 65440110021 in words is "sixty-five billion, four hundred forty million, one hundred ten thousand, twenty-one".