64918241109140 has 144 divisors (see below), whose sum is σ = 145411118374032. Its totient is φ = 24339163226112.

The previous prime is 64918241109133. The next prime is 64918241109331. The reversal of 64918241109140 is 4190114281946.

64918241109140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1060018503184 + 63858222605956 = 1029572^2 + 7991134^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2474288102 + ... + 2474314338.

It is an arithmetic number, because the mean of its divisors is an integer number (1009799433153).

Almost surely, 2^{64918241109140} 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 64918241109140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72705559187016).

64918241109140 is an abundant number, since it is smaller than the sum of its proper divisors (80492877264892).

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

64918241109140 is a wasteful number, since it uses less digits than its factorization.

64918241109140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29914 (or 29893 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 64918241109140 in words is "sixty-four trillion, nine hundred eighteen billion, two hundred forty-one million, one hundred nine thousand, one hundred forty".