643779412853 has 8 divisors (see below), whose sum is σ = 648790318176. Its totient is φ = 638769970800.

The previous prime is 643779412847. The next prime is 643779412877. The reversal of 643779412853 is 358214977346.

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

It is a cyclic number.

It is not a de Polignac number, because 643779412853 - 2²² = 643775218549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643779412792 and 643779412801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643779412883) 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, 525950 + ... + 1250672.

It is an arithmetic number, because the mean of its divisors is an integer number (81098789772).

Almost surely, 2^643779412853 is an apocalyptic number.

It is an amenable number.

643779412853 is a deficient number, since it is larger than the sum of its proper divisors (5010905323).

643779412853 is a wasteful number, since it uses less digits than its factorization.

643779412853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731635.

The product of its digits is 30481920, while the sum is 59.

The spelling of 643779412853 in words is "six hundred forty-three billion, seven hundred seventy-nine million, four hundred twelve thousand, eight hundred fifty-three".