6643042141 has 4 divisors (see below), whose sum is σ = 6668890812. Its totient is φ = 6617193472.

The previous prime is 6643042099. The next prime is 6643042157. The reversal of 6643042141 is 1412403466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4754792025 + 1888250116 = 68955^2 + 43454^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643042141 - 2⁷ = 6643042013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643042541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12923950 + ... + 12924463.

It is an arithmetic number, because the mean of its divisors is an integer number (1667222703).

Almost surely, 2^6643042141 is an apocalyptic number.

It is an amenable number.

6643042141 is a deficient number, since it is larger than the sum of its proper divisors (25848671).

6643042141 is a wasteful number, since it uses less digits than its factorization.

6643042141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25848670.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 6643042141 is about 81504.8596158536. The cubic root of 6643042141 is about 1879.8462735514.

The spelling of 6643042141 in words is "six billion, six hundred forty-three million, forty-two thousand, one hundred forty-one".