6640627187 has 2 divisors, whose sum is σ = 6640627188. Its totient is φ = 6640627186.

The previous prime is 6640627157. The next prime is 6640627219. The reversal of 6640627187 is 7817260466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6640627187 - 2¹⁰ = 6640626163 is a prime.

It is not a weakly prime, because it can be changed into another prime (6640627157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320313593 + 3320313594.

It is an arithmetic number, because the mean of its divisors is an integer number (3320313594).

Almost surely, 2^6640627187 is an apocalyptic number.

6640627187 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640627187 is an equidigital number, since it uses as much as digits as its factorization.

6640627187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 6640627187 is about 81490.0434838514. The cubic root of 6640627187 is about 1879.6184515985.

The spelling of 6640627187 in words is "six billion, six hundred forty million, six hundred twenty-seven thousand, one hundred eighty-seven".