6540442123 has 8 divisors (see below), whose sum is σ = 6776355600. Its totient is φ = 6305220768.

The previous prime is 6540442091. The next prime is 6540442171. The reversal of 6540442123 is 3212440456.

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 6540442123 - 2⁵ = 6540442091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6540452123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153753 + ... + 191626.

It is an arithmetic number, because the mean of its divisors is an integer number (847044450).

Almost surely, 2^6540442123 is an apocalyptic number.

6540442123 is a deficient number, since it is larger than the sum of its proper divisors (235913477).

6540442123 is a wasteful number, since it uses less digits than its factorization.

6540442123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346061.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 6540442123 is about 80872.9999629048. Note that the first 4 decimals coincide. The cubic root of 6540442123 is about 1870.1181088717.

Adding to 6540442123 its reverse (3212440456), we get a palindrome (9752882579).

The spelling of 6540442123 in words is "six billion, five hundred forty million, four hundred forty-two thousand, one hundred twenty-three".