6516565020 has 144 divisors (see below), whose sum is σ = 23427575808. Its totient is φ = 1489492800.

The previous prime is 6516565009. The next prime is 6516565043. The reversal of 6516565020 is 205656156.

It is a happy number.

6516565020 is a `hidden beast` number, since 65 + 16 + 565 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61756 + ... + 129795.

Almost surely, 2^6516565020 is an apocalyptic number.

6516565020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6516565020 is an abundant number, since it is smaller than the sum of its proper divisors (16911010788).

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

6516565020 is a wasteful number, since it uses less digits than its factorization.

6516565020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191582 (or 191568 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 6516565020 is about 80725.2440070639. The cubic root of 6516565020 is about 1867.8395956673.

It can be divided in two parts, 6516 and 565020, that added together give a square (571536 = 756²).

The spelling of 6516565020 in words is "six billion, five hundred sixteen million, five hundred sixty-five thousand, twenty".