646341143646 has 64 divisors (see below), whose sum is σ = 1449037255680. Its totient is φ = 190472031360.

The previous prime is 646341143629. The next prime is 646341143653.

646341143646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646341143595 and 646341143604.

It is a congruent number.

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, 4889595 + ... + 5020041.

It is an arithmetic number, because the mean of its divisors is an integer number (22641207120).

Almost surely, 2^646341143646 is an apocalyptic number.

646341143646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 646341143646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724518627840).

646341143646 is an abundant number, since it is smaller than the sum of its proper divisors (802696112034).

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

646341143646 is a wasteful number, since it uses less digits than its factorization.

646341143646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132529.

The product of its digits is 2985984, while the sum is 48.

It can be divided in two parts, 646341 and 143646, that added together give a palindrome (789987).

The spelling of 646341143646 in words is "six hundred forty-six billion, three hundred forty-one million, one hundred forty-three thousand, six hundred forty-six".