660260071 has 2 divisors, whose sum is σ = 660260072. Its totient is φ = 660260070.

The previous prime is 660260063. The next prime is 660260077. The reversal of 660260071 is 170062066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660260071 - 2³ = 660260063 is a prime.

It is a super-2 number, since 2×660260071² = 871886722713850082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660260077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330130035 + 330130036.

It is an arithmetic number, because the mean of its divisors is an integer number (330130036).

Almost surely, 2^660260071 is an apocalyptic number.

660260071 is a deficient number, since it is larger than the sum of its proper divisors (1).

660260071 is an equidigital number, since it uses as much as digits as its factorization.

660260071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 660260071 is about 25695.5262837717. The cubic root of 660260071 is about 870.7731142494.

The spelling of 660260071 in words is "six hundred sixty million, two hundred sixty thousand, seventy-one".