6509981511 has 12 divisors (see below), whose sum is σ = 10258152840. Its totient is φ = 3945443280.

The previous prime is 6509981497. The next prime is 6509981557. The reversal of 6509981511 is 1151899056.

6509981511 is a `hidden beast` number, since 6 + 50 + 9 + 9 + 81 + 511 = 666.

It is not a de Polignac number, because 6509981511 - 2⁶ = 6509981447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6509981561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32878596 + ... + 32878793.

It is an arithmetic number, because the mean of its divisors is an integer number (854846070).

Almost surely, 2^6509981511 is an apocalyptic number.

6509981511 is a deficient number, since it is larger than the sum of its proper divisors (3748171329).

6509981511 is a wasteful number, since it uses less digits than its factorization.

6509981511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65757406 (or 65757403 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 45.

The square root of 6509981511 is about 80684.4564398869. The cubic root of 6509981511 is about 1867.2103744869.

The spelling of 6509981511 in words is "six billion, five hundred nine million, nine hundred eighty-one thousand, five hundred eleven".