64815412640 has 96 divisors (see below), whose sum is σ = 168608672064. Its totient is φ = 23348899840.

The previous prime is 64815412631. The next prime is 64815412679. The reversal of 64815412640 is 4621451846.

64815412640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16232 + ... + 360408.

It is an arithmetic number, because the mean of its divisors is an integer number (1756340334).

Almost surely, 2^64815412640 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 64815412640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84304336032).

64815412640 is an abundant number, since it is smaller than the sum of its proper divisors (103793259424).

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

64815412640 is a wasteful number, since it uses less digits than its factorization.

64815412640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344310 (or 344302 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 64815412640 in words is "sixty-four billion, eight hundred fifteen million, four hundred twelve thousand, six hundred forty".