6640109507 has 2 divisors, whose sum is σ = 6640109508. Its totient is φ = 6640109506.

The previous prime is 6640109491. The next prime is 6640109557. The reversal of 6640109507 is 7059010466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6640109507 - 2⁴ = 6640109491 is a prime.

It is not a weakly prime, because it can be changed into another prime (6640109557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320054753 + 3320054754.

It is an arithmetic number, because the mean of its divisors is an integer number (3320054754).

Almost surely, 2^6640109507 is an apocalyptic number.

6640109507 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640109507 is an equidigital number, since it uses as much as digits as its factorization.

6640109507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 6640109507 is about 81486.8670829846. The cubic root of 6640109507 is about 1879.5696075090.

It can be divided in two parts, 66 and 40109507, that multiplied together give a palindrome (2647227462).

The spelling of 6640109507 in words is "six billion, six hundred forty million, one hundred nine thousand, five hundred seven".