6650520511 has 4 divisors (see below), whose sum is σ = 6651353800. Its totient is φ = 6649687224.

The previous prime is 6650520509. The next prime is 6650520559. The reversal of 6650520511 is 1150250566.

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

It is a cyclic number.

It is not a de Polignac number, because 6650520511 - 2¹ = 6650520509 is a prime.

It is a super-2 number, since 2×6650520511² = 88458846134463402242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650520571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404556 + ... + 420673.

It is an arithmetic number, because the mean of its divisors is an integer number (1662838450).

Almost surely, 2^6650520511 is an apocalyptic number.

6650520511 is a deficient number, since it is larger than the sum of its proper divisors (833289).

6650520511 is an equidigital number, since it uses as much as digits as its factorization.

6650520511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833288.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 6650520511 is about 81550.7235467595. The cubic root of 6650520511 is about 1880.5514180552.

The spelling of 6650520511 in words is "six billion, six hundred fifty million, five hundred twenty thousand, five hundred eleven".