6643409042 has 8 divisors (see below), whose sum is σ = 9980908032. Its totient is φ = 3316439700.

The previous prime is 6643409029. The next prime is 6643409099. The reversal of 6643409042 is 2409043466.

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

It is a super-3 number, since 3×6643409042³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6643408987 and 6643409005.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2630834 + ... + 2633357.

It is an arithmetic number, because the mean of its divisors is an integer number (1247613504).

Almost surely, 2^6643409042 is an apocalyptic number.

6643409042 is a deficient number, since it is larger than the sum of its proper divisors (3337498990).

6643409042 is a wasteful number, since it uses less digits than its factorization.

6643409042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264824.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 6643409042 is about 81507.1103769481. The cubic root of 6643409042 is about 1879.8808814296.

The spelling of 6643409042 in words is "six billion, six hundred forty-three million, four hundred nine thousand, forty-two".