6509680999 has 2 divisors, whose sum is σ = 6509681000. Its totient is φ = 6509680998.

The previous prime is 6509680993. The next prime is 6509681051. The reversal of 6509680999 is 9990869056.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6509680999 - 2⁵ = 6509680967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6509680993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3254840499 + 3254840500.

It is an arithmetic number, because the mean of its divisors is an integer number (3254840500).

Almost surely, 2^6509680999 is an apocalyptic number.

6509680999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6509680999 is an equidigital number, since it uses as much as digits as its factorization.

6509680999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9447840, while the sum is 61.

The square root of 6509680999 is about 80682.5941514029. The cubic root of 6509680999 is about 1867.1816428253.

The spelling of 6509680999 in words is "six billion, five hundred nine million, six hundred eighty thousand, nine hundred ninety-nine".