646324532205144 has 256 divisors, whose sum is σ = 1861244324352000. Its totient is φ = 185369018503680.

The previous prime is 646324532205137. The next prime is 646324532205179. The reversal of 646324532205144 is 441502235423646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 332260879 + ... + 334200449.

It is an arithmetic number, because the mean of its divisors is an integer number (7270485642000).

Almost surely, 2^{646324532205144} 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 646324532205144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930622162176000).

646324532205144 is an abundant number, since it is smaller than the sum of its proper divisors (1214919792146856).

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

646324532205144 is a wasteful number, since it uses less digits than its factorization.

646324532205144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940518 (or 1940514 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 51.

The spelling of 646324532205144 in words is "six hundred forty-six trillion, three hundred twenty-four billion, five hundred thirty-two million, two hundred five thousand, one hundred forty-four".