6640143541 has 4 divisors (see below), whose sum is σ = 6989624800. Its totient is φ = 6290662284.

The previous prime is 6640143529. The next prime is 6640143553. The reversal of 6640143541 is 1453410466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1453410466 = 2 ⋅726705233.

It is an interprime number because it is at equal distance from previous prime (6640143529) and next prime (6640143553).

It is a cyclic number.

It is not a de Polignac number, because 6640143541 - 2¹⁷ = 6640012469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6640143497 and 6640143506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640143571) 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, 174740601 + ... + 174740638.

It is an arithmetic number, because the mean of its divisors is an integer number (1747406200).

Almost surely, 2^6640143541 is an apocalyptic number.

It is an amenable number.

6640143541 is a deficient number, since it is larger than the sum of its proper divisors (349481259).

6640143541 is a wasteful number, since it uses less digits than its factorization.

6640143541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349481258.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 6640143541 is about 81487.0759139141. The cubic root of 6640143541 is about 1879.5728187594.

The spelling of 6640143541 in words is "six billion, six hundred forty million, one hundred forty-three thousand, five hundred forty-one".