643349350929 has 8 divisors (see below), whose sum is σ = 858843960192. Its totient is φ = 428377154480.

The previous prime is 643349350921. The next prime is 643349350951. The reversal of 643349350929 is 929053943346.

It is a happy number.

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 643349350929 - 2³ = 643349350921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643349350921) 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, 130600329 + ... + 130605254.

It is an arithmetic number, because the mean of its divisors is an integer number (107355495024).

Almost surely, 2^643349350929 is an apocalyptic number.

It is an amenable number.

643349350929 is a deficient number, since it is larger than the sum of its proper divisors (215494609263).

643349350929 is a wasteful number, since it uses less digits than its factorization.

643349350929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261206407.

The product of its (nonzero) digits is 18895680, while the sum is 57.

The spelling of 643349350929 in words is "six hundred forty-three billion, three hundred forty-nine million, three hundred fifty thousand, nine hundred twenty-nine".