660252211 has 2 divisors, whose sum is σ = 660252212. Its totient is φ = 660252210.

The previous prime is 660252209. The next prime is 660252247. The reversal of 660252211 is 112252066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660252211 - 2¹ = 660252209 is a prime.

Together with 660252209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (660252011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330126105 + 330126106.

It is an arithmetic number, because the mean of its divisors is an integer number (330126106).

Almost surely, 2^660252211 is an apocalyptic number.

660252211 is a deficient number, since it is larger than the sum of its proper divisors (1).

660252211 is an equidigital number, since it uses as much as digits as its factorization.

660252211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 660252211 is about 25695.3733384047. The cubic root of 660252211 is about 870.7696588919.

The spelling of 660252211 in words is "six hundred sixty million, two hundred fifty-two thousand, two hundred eleven".