667241561 has 24 divisors (see below), whose sum is σ = 785252160. Its totient is φ = 555349536.

The previous prime is 667241527. The next prime is 667241567. The reversal of 667241561 is 165142766.

667241561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667241561 - 2²⁶ = 600132697 is a prime.

It is a super-2 number, since 2×667241561² = 890422601451433442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667241567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3386915 + ... + 3387111.

It is an arithmetic number, because the mean of its divisors is an integer number (32718840).

Almost surely, 2^667241561 is an apocalyptic number.

It is an amenable number.

667241561 is a deficient number, since it is larger than the sum of its proper divisors (118010599).

667241561 is a wasteful number, since it uses less digits than its factorization.

667241561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 402 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 667241561 is about 25831.0193565798. The cubic root of 667241561 is about 873.8315008200.

The spelling of 667241561 in words is "six hundred sixty-seven million, two hundred forty-one thousand, five hundred sixty-one".