660242069 has 2 divisors, whose sum is σ = 660242070. Its totient is φ = 660242068.

The previous prime is 660242057. The next prime is 660242083. The reversal of 660242069 is 960242066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366531025 + 293711044 = 19145^2 + 17138^2 .

It is a cyclic number.

It is not a de Polignac number, because 660242069 - 2²⁴ = 643464853 is a prime.

It is a super-2 number, since 2×660242069² = 871839179354801522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660242029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330121034 + 330121035.

It is an arithmetic number, because the mean of its divisors is an integer number (330121035).

Almost surely, 2^660242069 is an apocalyptic number.

It is an amenable number.

660242069 is a deficient number, since it is larger than the sum of its proper divisors (1).

660242069 is an equidigital number, since it uses as much as digits as its factorization.

660242069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 660242069 is about 25695.1759869435. The cubic root of 660242069 is about 870.7652002972.

The spelling of 660242069 in words is "six hundred sixty million, two hundred forty-two thousand, sixty-nine".