6403540505 has 8 divisors (see below), whose sum is σ = 7728667272. Its totient is φ = 5093219968.

The previous prime is 6403540499. The next prime is 6403540523. The reversal of 6403540505 is 5050453046.

It can be written as a sum of positive squares in 4 ways, for example, as 3472509184 + 2931031321 = 58928^2 + 54139^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6403540505 is a prime.

It is a Duffinian 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, 3700604 + ... + 3702333.

It is an arithmetic number, because the mean of its divisors is an integer number (966083409).

Almost surely, 2^6403540505 is an apocalyptic number.

It is an amenable number.

6403540505 is a deficient number, since it is larger than the sum of its proper divisors (1325126767).

6403540505 is a wasteful number, since it uses less digits than its factorization.

6403540505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7403115.

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 6403540505 is about 80022.1250967506. The cubic root of 6403540505 is about 1856.9778363416.

The spelling of 6403540505 in words is "six billion, four hundred three million, five hundred forty thousand, five hundred five".