6640354123 has 8 divisors (see below), whose sum is σ = 7224875168. Its totient is φ = 6066365184.

The previous prime is 6640354117. The next prime is 6640354129. The reversal of 6640354123 is 3214530466.

It is an interprime number because it is at equal distance from previous prime (6640354117) and next prime (6640354129).

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 6640354123 - 2¹³ = 6640345931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640354129) 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, 2631711 + ... + 2634232.

It is an arithmetic number, because the mean of its divisors is an integer number (903109396).

Almost surely, 2^6640354123 is an apocalyptic number.

6640354123 is a deficient number, since it is larger than the sum of its proper divisors (584521045).

6640354123 is a wasteful number, since it uses less digits than its factorization.

6640354123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266053.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 6640354123 is about 81488.3680226816. The cubic root of 6640354123 is about 1879.5926878087.

Adding to 6640354123 its reverse (3214530466), we get a palindrome (9854884589).

The spelling of 6640354123 in words is "six billion, six hundred forty million, three hundred fifty-four thousand, one hundred twenty-three".