660841669 has 2 divisors, whose sum is σ = 660841670. Its totient is φ = 660841668.

The previous prime is 660841639. The next prime is 660841729. The reversal of 660841669 is 966148066.

660841669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551639169 + 109202500 = 23487^2 + 10450^2 .

It is a cyclic number.

It is not a de Polignac number, because 660841669 - 2⁵ = 660841637 is a prime.

It is a super-2 number, since 2×660841669² = 873423422973411122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660841619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330420834 + 330420835.

It is an arithmetic number, because the mean of its divisors is an integer number (330420835).

Almost surely, 2^660841669 is an apocalyptic number.

It is an amenable number.

660841669 is a deficient number, since it is larger than the sum of its proper divisors (1).

660841669 is an equidigital number, since it uses as much as digits as its factorization.

660841669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 660841669 is about 25706.8408988736. The cubic root of 660841669 is about 871.0287161935.

The spelling of 660841669 in words is "six hundred sixty million, eight hundred forty-one thousand, six hundred sixty-nine".