660005611 has 2 divisors, whose sum is σ = 660005612. Its totient is φ = 660005610.

The previous prime is 660005561. The next prime is 660005617. The reversal of 660005611 is 116500066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660005611 - 2¹³ = 659997419 is a prime.

It is not a weakly prime, because it can be changed into another prime (660005617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330002805 + 330002806.

It is an arithmetic number, because the mean of its divisors is an integer number (330002806).

Almost surely, 2^660005611 is an apocalyptic number.

660005611 is a deficient number, since it is larger than the sum of its proper divisors (1).

660005611 is an equidigital number, since it uses as much as digits as its factorization.

660005611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 660005611 is about 25690.5743610376. The cubic root of 660005611 is about 870.6612364166.

Adding to 660005611 its reverse (116500066), we get a palindrome (776505677).

The spelling of 660005611 in words is "six hundred sixty million, five thousand, six hundred eleven".