6509072691 has 24 divisors (see below), whose sum is σ = 10271976624. Its totient is φ = 3939024960.

The previous prime is 6509072677. The next prime is 6509072719. The reversal of 6509072691 is 1962709056.

It is a happy number.

It is not a de Polignac number, because 6509072691 - 2¹⁵ = 6509039923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6509072621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18465 + ... + 115581.

It is an arithmetic number, because the mean of its divisors is an integer number (427999026).

Almost surely, 2^6509072691 is an apocalyptic number.

6509072691 is a deficient number, since it is larger than the sum of its proper divisors (3762903933).

6509072691 is a wasteful number, since it uses less digits than its factorization.

6509072691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97811 (or 97808 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 6509072691 is about 80678.8243035308. The cubic root of 6509072691 is about 1867.1234803791.

The spelling of 6509072691 in words is "six billion, five hundred nine million, seventy-two thousand, six hundred ninety-one".