660606511 has 2 divisors, whose sum is σ = 660606512. Its totient is φ = 660606510.

The previous prime is 660606509. The next prime is 660606517. The reversal of 660606511 is 115606066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660606511 - 2¹ = 660606509 is a prime.

Together with 660606509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660606517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330303255 + 330303256.

It is an arithmetic number, because the mean of its divisors is an integer number (330303256).

Almost surely, 2^660606511 is an apocalyptic number.

660606511 is a deficient number, since it is larger than the sum of its proper divisors (1).

660606511 is an equidigital number, since it uses as much as digits as its factorization.

660606511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 660606511 is about 25702.2666510174. The cubic root of 660606511 is about 870.9253865150.

The spelling of 660606511 in words is "six hundred sixty million, six hundred six thousand, five hundred eleven".