643826963339 has 8 divisors (see below), whose sum is σ = 745881727200. Its totient is φ = 544292070336.

The previous prime is 643826963333. The next prime is 643826963371. The reversal of 643826963339 is 933369628346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-643826963339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643826963333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629967164 + ... + 629968185.

It is an arithmetic number, because the mean of its divisors is an integer number (93235215900).

Almost surely, 2^643826963339 is an apocalyptic number.

643826963339 is a deficient number, since it is larger than the sum of its proper divisors (102054763861).

643826963339 is a wasteful number, since it uses less digits than its factorization.

643826963339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259935429.

The product of its digits is 90699264, while the sum is 62.

The spelling of 643826963339 in words is "six hundred forty-three billion, eight hundred twenty-six million, nine hundred sixty-three thousand, three hundred thirty-nine".