6505121504 has 48 divisors (see below), whose sum is σ = 15406876800. Its totient is φ = 2641175424.

The previous prime is 6505121489. The next prime is 6505121507. The reversal of 6505121504 is 4051215056.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6505121507) 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, 759974 + ... + 768485.

It is an arithmetic number, because the mean of its divisors is an integer number (320976600).

Almost surely, 2^6505121504 is an apocalyptic number.

It is an amenable number.

6505121504 is an abundant number, since it is smaller than the sum of its proper divisors (8901755296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6505121504 is a wasteful number, since it uses less digits than its factorization.

6505121504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528495 (or 1528487 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 6505121504 is about 80654.3334483647. Note that the first 3 decimals coincide. The cubic root of 6505121504 is about 1866.7456053919.

The spelling of 6505121504 in words is "six billion, five hundred five million, one hundred twenty-one thousand, five hundred four".