6640550405 has 8 divisors (see below), whose sum is σ = 8021433984. Its totient is φ = 5277258000.

The previous prime is 6640550381. The next prime is 6640550437. The reversal of 6640550405 is 5040550466.

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

It is not a de Polignac number, because 6640550405 - 2¹² = 6640546309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4396961 + ... + 4398470.

It is an arithmetic number, because the mean of its divisors is an integer number (1002679248).

Almost surely, 2^6640550405 is an apocalyptic number.

It is an amenable number.

6640550405 is a deficient number, since it is larger than the sum of its proper divisors (1380883579).

6640550405 is a wasteful number, since it uses less digits than its factorization.

6640550405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8795587.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 6640550405 is about 81489.5723697210. The cubic root of 6640550405 is about 1879.6112072315.

The spelling of 6640550405 in words is "six billion, six hundred forty million, five hundred fifty thousand, four hundred five".