6520615266 has 32 divisors (see below), whose sum is σ = 14236181568. Its totient is φ = 1974640640.

The previous prime is 6520615249. The next prime is 6520615267. The reversal of 6520615266 is 6625160256.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6520615267) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 70690 + ... + 134306.

It is an arithmetic number, because the mean of its divisors is an integer number (444880674).

Almost surely, 2^6520615266 is an apocalyptic number.

6520615266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6520615266 is an abundant number, since it is smaller than the sum of its proper divisors (7715566302).

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

6520615266 is a wasteful number, since it uses less digits than its factorization.

6520615266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65186.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 6520615266 is about 80750.3267237972. The cubic root of 6520615266 is about 1868.2264888149.

The spelling of 6520615266 in words is "six billion, five hundred twenty million, six hundred fifteen thousand, two hundred sixty-six".