64432561408 has 72 divisors (see below), whose sum is σ = 133984690560. Its totient is φ = 30897500160.

The previous prime is 64432561393. The next prime is 64432561411. The reversal of 64432561408 is 80416523446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567241 + ... + 671287.

It is an arithmetic number, because the mean of its divisors is an integer number (1860898480).

Almost surely, 2^64432561408 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 64432561408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66992345280).

64432561408 is an abundant number, since it is smaller than the sum of its proper divisors (69552129152).

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

64432561408 is a wasteful number, since it uses less digits than its factorization.

64432561408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104163 (or 104149 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 64432561408 in words is "sixty-four billion, four hundred thirty-two million, five hundred sixty-one thousand, four hundred eight".