6505409002 has 4 divisors (see below), whose sum is σ = 9758113506. Its totient is φ = 3252704500.

The previous prime is 6505408981. The next prime is 6505409063. The reversal of 6505409002 is 2009045056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3503574481 + 3001834521 = 59191^2 + 54789^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1626352249 + ... + 1626352252.

Almost surely, 2^6505409002 is an apocalyptic number.

6505409002 is a deficient number, since it is larger than the sum of its proper divisors (3252704504).

6505409002 is a wasteful number, since it uses less digits than its factorization.

6505409002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252704503.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 6505409002 is about 80656.1157135651. The cubic root of 6505409002 is about 1866.7731056582.

The spelling of 6505409002 in words is "six billion, five hundred five million, four hundred nine thousand, two".