6515606420 has 24 divisors (see below), whose sum is σ = 13907083848. Its totient is φ = 2563516800.

The previous prime is 6515606411. The next prime is 6515606437. The reversal of 6515606420 is 246065156.

It can be written as a sum of positive squares in 4 ways, for example, as 379704196 + 6135902224 = 19486^2 + 78332^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669111 + ... + 2671550.

It is an arithmetic number, because the mean of its divisors is an integer number (579461827).

Almost surely, 2^6515606420 is an apocalyptic number.

It is an amenable number.

6515606420 is an abundant number, since it is smaller than the sum of its proper divisors (7391477428).

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

6515606420 is a wasteful number, since it uses less digits than its factorization.

6515606420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340731 (or 5340729 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 6515606420 is about 80719.3063647105. The cubic root of 6515606420 is about 1867.7480035052.

The spelling of 6515606420 in words is "six billion, five hundred fifteen million, six hundred six thousand, four hundred twenty".