64640556465352 has 128 divisors (see below), whose sum is σ = 148165023744000. Its totient is φ = 25821340807680.

The previous prime is 64640556465343. The next prime is 64640556465431. The reversal of 64640556465352 is 25356465504646.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57111577 + ... + 58232407.

It is an arithmetic number, because the mean of its divisors is an integer number (1157539248000).

Almost surely, 2^{64640556465352} 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 64640556465352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74082511872000).

64640556465352 is an abundant number, since it is smaller than the sum of its proper divisors (83524467278648).

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

64640556465352 is a wasteful number, since it uses less digits than its factorization.

64640556465352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121739 (or 1121735 counting only the distinct ones).

The product of its (nonzero) digits is 311040000, while the sum is 61.

The spelling of 64640556465352 in words is "sixty-four trillion, six hundred forty billion, five hundred fifty-six million, four hundred sixty-five thousand, three hundred fifty-two".