6640250501 has 2 divisors, whose sum is σ = 6640250502. Its totient is φ = 6640250500.

The previous prime is 6640250497. The next prime is 6640250531. The reversal of 6640250501 is 1050520466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5542653601 + 1097596900 = 74449^2 + 33130^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640250501 - 2² = 6640250497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640250531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320125250 + 3320125251.

It is an arithmetic number, because the mean of its divisors is an integer number (3320125251).

Almost surely, 2^6640250501 is an apocalyptic number.

It is an amenable number.

6640250501 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640250501 is an equidigital number, since it uses as much as digits as its factorization.

6640250501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 6640250501 is about 81487.7322116648. The cubic root of 6640250501 is about 1879.5829108117.

Adding to 6640250501 its reverse (1050520466), we get a palindrome (7690770967).

The spelling of 6640250501 in words is "six billion, six hundred forty million, two hundred fifty thousand, five hundred one".