66467561 has 4 divisors (see below), whose sum is σ = 66732624. Its totient is φ = 66202500.

The previous prime is 66467549. The next prime is 66467563. The reversal of 66467561 is 16576466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66467561 - 2⁶ = 66467497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66467563) 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 in 3 ways as a sum of consecutive naturals, for example, 132155 + ... + 132656.

It is an arithmetic number, because the mean of its divisors is an integer number (16683156).

Almost surely, 2^66467561 is an apocalyptic number.

It is an amenable number.

66467561 is a deficient number, since it is larger than the sum of its proper divisors (265063).

66467561 is a wasteful number, since it uses less digits than its factorization.

66467561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265062.

The product of its digits is 181440, while the sum is 41.

The square root of 66467561 is about 8152.7640098313. The cubic root of 66467561 is about 405.0760635472.

The spelling of 66467561 in words is "sixty-six million, four hundred sixty-seven thousand, five hundred sixty-one".