6445503405 has 24 divisors (see below), whose sum is σ = 12187861920. Its totient is φ = 3125092320.

The previous prime is 6445503349. The next prime is 6445503413. The reversal of 6445503405 is 5043055446.

6445503405 is a `hidden beast` number, since 64 + 4 + 550 + 3 + 40 + 5 = 666.

It is not a de Polignac number, because 6445503405 - 2¹⁰ = 6445502381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6445503405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6510115 + ... + 6511104.

It is an arithmetic number, because the mean of its divisors is an integer number (507827580).

Almost surely, 2^6445503405 is an apocalyptic number.

It is an amenable number.

6445503405 is a deficient number, since it is larger than the sum of its proper divisors (5742358515).

6445503405 is a wasteful number, since it uses less digits than its factorization.

6445503405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13021241 (or 13021238 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The square root of 6445503405 is about 80283.8925625807. The cubic root of 6445503405 is about 1861.0253148565.

The spelling of 6445503405 in words is "six billion, four hundred forty-five million, five hundred three thousand, four hundred five".