643346535620 has 144 divisors (see below), whose sum is σ = 1545854439360. Its totient is φ = 224115849216.

The previous prime is 643346535619. The next prime is 643346535647. The reversal of 643346535620 is 26535643346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4654142 + ... + 4790378.

Almost surely, 2^643346535620 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 643346535620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772927219680).

643346535620 is an abundant number, since it is smaller than the sum of its proper divisors (902507903740).

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

643346535620 is a wasteful number, since it uses less digits than its factorization.

643346535620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136342 (or 136323 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 47.

The spelling of 643346535620 in words is "six hundred forty-three billion, three hundred forty-six million, five hundred thirty-five thousand, six hundred twenty".